hurricane dorian in the bahamas will only be allowed to enter the u.s. if they have proper documentation. he said he's worried that gang members could come in. errol barnett is in the bahamas where the official death toll is 45, but expected t >> reporter: ready for the worst, teams on abaco island are searching through rubble. on grand bahama island, nicole crews from miami and dade county search for the missing. as the days go on, she says the likelihood of success is slipping away. this now-flattened seaside house is where seven of pinder's relatives rode out dorian, including six-year-old omarion munnings, now missing. on this day they found nothing. bahamian officials say the total number of missing may be unknown for weeks. teams working through a flattened landscape, searching remote areas not reached since dorian hit a week ago. the building anxiety evident on social media. people hopeful for any news on their loved ones.

this post reads, "if you see vito, tell him contact his mum, please." the united nations says the storm left more than 70,000 homeless. many bahamians say faith is all that's getting them by. now, it would seem time is working against hope. this country is receiving assistance in search and recovery from the u.s., u.k., jamaica, and trinidad and tobago, but the harsh reality is human remains decompose quickly at sea, so many may remain missing, norah, forever. >> oh, that is so heart breaking. errol, thank you. back here at home, new accusations tonight the administration may have tried to pressure the national weather service to change a hurricane dorian advisory to cover up a mistake by the president. weijia jiang is traveling with the president in north carolina, and, ouija, what have you learned? >> reporter: norah, a top scientist said he was

investigating the policies of scientific rer integrity. he was reacting to a press release that backed the claim president trump said hurricane dorian could hit alabama hard. after the comments the national weather service in birmingham contradicted them in a tweet saying, alabama will not see any impacts from dorian. the unsigned noaa release said that was wrong. this afternoon they said it was not wrong because secretary wilbur ross threatened to have people fired, something they are denying altogether. they stood by the birmingham office tweet saying it was sent out for one reason, public safety. norah? >> all right, in north carolina where the president's campaigning tonight for a special house election. thank you. we'll be right back. $9.95 at my age?

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shhhh. i took mucinex dm for my phlegmy cough. what about rob's dry cough? works on that too. and lasts 12 hours. 12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill. hard work leaves a mark. it shows on your clothes. grit, dirt, and every stain the job throws at you. new tide heavy duty. designed for impossible stains. now a cbs news exclusive. three former heads of homeland security addressed the biggest security threats to this country. michael chertoff, janet napolitano, and jeh johnson gathered today at the national september 11th memorial and museum in new york city. this all ahead of the anniversary of the attacks. they served under presidents george w. bush and barack obama and address the rising challenges facing this current

administration. it's been 18 years since 9/11. we're here at this very solemn memorial. the threat has changed dramatically. we face increasing home-grown threats. what's happened? >> the terrorist threat to our homeland has evolved significantly over the past 18 years from what i refer to as terrorist directed attacks to smaller-scale, terrorist-inspired attacks, inspired by a terrorist group overseas or by extreme right-wing violent nationalism. in fact, that type of attack is now outpacing attacks inspired by foreign terrorist organizations. >> secretary johnson, how do you view the agency right now? >> i have to say, i view the agency with a fair amount of despair and dismay.

i think our old agency has become overly politicized. it is overwhelmed with the immigration mission, which is itself overly politicized, very, very emotional. >> secretary chertoff, the head of homeland security, the head of fema, all the agencies overseeing immigration have acting leaders, not confirmed. how does that hamper or hurt our national security? >> the reality is if you don't have a senate confirmation, you're living day to day, and that affects not only your ability to plan strategically, but the way in which you're received by other agencies, other departments, and even other countries. >> you all agree climate change is a big threat. >> yes. >> yes. >> when people say, i don't understand, how does climate change affect homeland security, >>heyou'realkibout global warming as a whole, that affects migration patterns.

that affects areas of the world where the agricultural economy has been lost, and therefore they are perhaps more ripe for the rise of terrorism, terrorist recruitment. so there are all kinds of downstream effects from global warming. >> we're now 14 months away from the next presidential election. how concerned are you that foreign governments are going to do everything they can to cause chaos? >> very. >> the russians are the most blatant, but the chinese and the iranians play this game, too. >> the election may be 14 months away, but the campaign is now. and we are probably, as we speak, suffering from the foreign influence on our democracy through pushing out extremist views and fake news. >> they say that's happening now. chertoff also said he's concerned about the use of deep fakes by our adversaries, those are these doctored video clips that appear and sound real.

secretary johnson said that use of those deep fakes may require all of us in the american public to be more skeptical about what we see. we'll have much more of this interview beginning on the anniversary on 9/11. it will be in our 24-hour streaming channel, news channel, cbsn. there is still much more ahead right here. what's behind the spike of high brood blood pressure during pregnancy. and alex trebek's emotional return to jeopardy after his brave cancer battle. liz, you nerd, cough if you're in here! shhhh. i took mucinex dm for my phlegmy cough. what about rob's dry cough? works on that too. and lasts 12 hours.

12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill. my car insurance to geico. this is how it made me feel. it was like that feeling when you pull your green sock out of the dryer and then the very next sock is the other green one. and then you pull out two blue ones. and you keep going till you've matched every single sock in perfect order. and the owner of the laundromat is so impressed, he hangs a picture of you next to the dryer. geico. fifteen minutes could save you fifteen percent or more on car insurance. shhhh. i took mucinex dm for my phlegmy cough. what about rob's dry cough? works on that too. and lasts 12 hours. 12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill.

we turn now to this new study tonight that finds an alarming rise of high blood pressure among american women during pregnancy. dr. tara narula explains why women getting pregnant later in life contributes to this upward trend. >> 31-year-old chanelle bradley is pregnant with her second child and is hoping medication will control her high blood pressure. >> we're just going to induce early before i even get to that superhigh scary point. >> reporter: bradley developed hypertension during her first pregnancy, which caused her to deliver her first pregnancy six weeks early. today's study finds a huge spike in high blood pressure cases during pregnancy, increasing 13fold over the past 40 years. researchers defined high blood african american women were twice as likely to have high blood pressure as whites.

high blood pressure raises the risk of complications such as stroke, kidney failure, and stillborn or infant death. dr. amy stoddard of u.c.l.a. health says age is a factor in the rising rate of hypertension during pregnancy. >> one of the main things we can attribute that to is older maternal age in pregnancy. women are waiting longer to have their first baby. >> so, dr. tara narula joins us now. so, what can women do to make sure they have a healthy pregnancy? >> i can't emphasize enough the value of controlling blood pressure in the health of the mom and baby. best first present you give your while. hypertension complicates 10 to 15% of first pregnancies and is a leading cause of infant mortality. women should know their blood pressure and when they're ready to get pregnant, they should speak to their doctor about how best to control their blood pressure, whether it's with diet, exercise, stopping smoking or medication. and finally we know that pregnancy is a stress test, it's a marker of your future

cardiovascular

new developments tonight in the backlash against big tech. attorneys general for 48 states, washington, d.c., and puerto rico announced a sweeping anti-trust investigation into google. they want to know if google has become so big and so powerful that it unlawfully hurts consumers and competition. today president trump honored some heroes who helped save lives in two mass shootings last month. six ohio police officers were given the medal of valor. that's the nation's highest award for public safety. the officers took down the shooter who killed nine in dayton about half a minute after he started firing. the president also recognized five civilians who put themselves at risk to help others escape the shooter at a walmart in el paso, texas. up next, the return of alex trebek.

tonight we're going to end with a beginning. a new season for america's favorite quiz show and its legendary host. >> i'm happy to report i'm still

here. our champion jason-- (cheering and applause). thank you. >> if the answer is resilience personified, the question is: who is alex trebek? >> it's another day at the office for me. >> the "jeopardy!" host began his 36th season tonight after facing uncertainty in march when he announced he had been diagnosed with stage four pancreatic cancer. >> put your hands together. [ cheers and applause ] >> this summer he celebrated his 79th birthday and announced he had completed chemotherapy. >> i'm on the mend, and that's all i can hope for right now. >> earlier he told cbs sunday morning's jane pauley what his post-chemotherapy project would be. >> we have the summer months off, so hopefully my own hair will grow back. >> and we wish you, alex, a daily double of good health. i know this is a show i grew up watching every night with my parents. i'm norah o'donnell here in new york. we'll see you tomorrow right back here. good night.

♪ ♪ >> announcer: this is the "cbs overnight news." >> welcome to the overnight news. i'm don dahler. tense moments in the waters off brunswick, georgia, where a huge cargo shiploaded with vehicles flipped on its side. the coast guard managed to pull nearly all of the crew off the ship before a fire broke out, then the race was on to save the crew members still trapped on board. meg oliver has the story. >> reporter: the dramatic rescues played out under the hot georgia sun. >> one, two, three. >> reporter: after more than 30 hours trapped inside the dark underbelly of the cargo ship with temperatures in triple digits, the coast guard began to pull the south korean crew members one by one. captain, when you first

discovered they were alive, what went through your mind? >> i was elated. whene tapping was coming back and they had it consistently throughout the night, those -- that made all the difference in the world. it made a huge difference in the world to the team that was able to get out there and extract them. >> reporter: the first three crew members were pulled out quickly once they were found. the fourth, trapped behind glass with no food or water for more then a day, has proven to be most challenging to retrieve. cameras caught him emerging from the hull. it all began early sunday morning off the georgia coast. the massive vessel, nearly two football fields in length, was carrying 4,200 vehicles when it began to list. the coast guard airlifted 20 crew members to safety before a fire stopped the effort. the rescue operation resumed today, plucking the men out of the darkness. >> i know they looked very happy to be out of that ship and into the dayl.

>> reporter: because of its sheer size and location, this is going to be a monumental task to upright and tow back to port. >> the 18 year war in afghanistan is by far the longest military conflict in u.s. it lik endingimon. the on again/off again negotiations with the taliban are off again. after president trump pulled the plug on a secret summit at camp david. margaret brennan reports. >> they're dead. they're dead. as far as i'm concerned, they're dead. >> reporter: president trump said it was his decision to plan and then call off the summit at camp david with the taliban, the al qaeda-linked group responsible for the deaths of thousands of american troops. >> it was my idea, and it was my idea to terminate it. >> reporter: mr. trump remained vague on whether he will still cut the number of u.s. troops in afghanistan from 14,000 down to 8,600. >> we'd like to get out, but we'll get out at the right time. >> reporter: on saturday mr. trump claimed he ended the talks following a kabul bombing two days prior that killed sergeant first class elis barreto, the

16th u.s. fatality this year, but a senior u.s. official told cbs it was not that simple. it appeared the taliban negotiators did not have full control over their fighters and the president's advisers were at odds over whether a troop drawdown should happen with or without a negotiated deal. there was also confusion over whether the taliban had agreed to even attend the camp david meeting. that would have put the very same group that harbored osama bin laden at the presidential retreat where u.s. officials fled the night of the 9/11 attacks. >> they should not be allowed not just in the united states of america, but they especially shouldn't be allowed in such a place of honor when you think about all the history of camp david and the role of that plays. >> and what does all this mean for the us troops in afghanistan? charlie d'agata has the view from kabul. [ gunfire ] >> reporter: with taliban peace talks in tatters, afghanistan is

now bracing for the backlash. the militant group had stepped up a vicious campaign of violence throughout the country, and that was during negotiations with the u.s. afghan government officials have insisted washington should have demanded a ceasefire before any promise of a u.s. troop drawdown. abdullah abdullah is afghanistan's chief executive. >> a complete withdrawal without any progress in the peace process or the negotiations and also a taliban violating the commitments that they are making, that will have a serious negative impact. >> reporter: it would be a disaster? >> it would be a very serious situation. >> reporter: such a serious situation that afghanistan could once again become a safe haven for international terrorists as it was when the taliban supported al qaeda and osama bin laden. the taliban says the u.s. will have the most to lose from walking away now. the collapse of the talks comes at a critical time. presidential elections are due to be held here in just a few weeks. they have been a taliban target in the past, and now there's not much of an incentive to hold

anything back. the collapse of the talks comes at a critical time. presidential elections are due to be held here in a few weeks. they have been a taliban target in the past and now there is not much of an unsentive to hold anything back. >> president trump's lawyers are about so get very busy. the house judiciary committee opened a formal impeachment inquiry as a new scandal erupted over mr. trump's business dealings in ukraine. nancy cordes has that. >> i don't need to have somebody take a room overnight at a hotel. >> reporter: president trump's properties are the latest focus of the impeachment inquiry after a slew of government spending at his resorts this summer. >> we're going to look at the money that's flowing in through the trump office tower, through the golf resorts, both in america and abroad. >> reporter: maryland democrat ciy committee, wchon the house announced today it is formalizing its impeachment probe with a new resolution

establishing procedures for impeachment-related hearings, allowing lawmakers and committee staff to grill witnesses like former trump campaign manager corey lewandowski, who is set to testify next week. republicans say this is proof that democrats are obsessed with impeachment. >> none of us is obsessed with impeachment. we are confronted unfortunately on a daily basis with the evidence of the high crimes and misdemeanors of the president. >> reporter: the white house called it a vendetta and more of the same from the democrats. democratic support for an impeachment inquiry swelled while congress was gone. 32 more house democrats came out in favor, and an inquiry, nora, is the precursor to a formal impeachment proceeding. something some of those democrats would like to pursue before the 2020 election. >> hurricane dorian is now just a faded memory for most of us, but the destruction it brought to the bahamas will live on

possibly for generations. errol barnett is there. >> reporter: ready for the worst, teams on abaco island are searching through rubble. on grand bahama island, nicole . as the days go on, she says the likelihood of success is slipping away. this now-flattened seaside house is where seven of pinder's relatives rode out dorian, including six-year-old omarion munnings, now missing. on this day they fund nothing. bahamian officials say the total number of missing may be unknown for weeks. teams working through a flattened landscape, searching remote areas not reached since dorian hit a week ago. the building anxiety evident on social media. people hopeful for any news on their loved ones. this post reads, "if you see vito, tell him contact his mum, please." the united nations says the storm left more than 70,000 homeless.

many bahamians say faith is all that's getting them by. my lady! those darn seatbelts got me all crumpled up. that's ok! hey, guys! hi mrs. patterson... wrinkles send the wrong message. sorry. help prevent them before they start with new downy wrinkleguard. that's better. so you won't get caught with wrinkles again. shhhh. i took mucinex dm for my phlegmy cough. what about rob's dry cough? works on that too. and lasts 12 hours. 12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill.

shhhh. i took mucinex dm for my phlegmy cough. what about rob's dry cough? works on that too. and lasts 12 hours. 12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill. but we were made to move. so move more! live more! ♪ degree motionsense made to move.

♪ ♪ >> announcer: this is the "cbs overnight news." >> welcome back to the overnight news. i'm don dahler. the cdc is sounding the alarm over the possible health effects of vaping. so far at least five deaths have been potentially linked to e-cigarettes, and that's on top of more than 450 cases of severe lung disease. dr. tara nar introduces us to parents who say vaping nearly took their daughter's life. >> reporter: they were watching her fight for her life in the icu. >> every doctor she saw asked are you a smoker?

she said no. what about e-cigarettes? she said yes. >> reporter: piper was dying noticed with colorado's first case of a rare vaping related illness. the college freshman had been vaping two years. >> we're mad these things are out there and we're mad they're easily accessible. >> reporter: juul is the top-selling e-cigarette company in the u.s. and is often blamed for the surge in youth vaping. we spoke with c.e.o. kevin burns last month. >> you don't think juul caused it? >> well, some people could have used our product, but there's never an intent on the company's part to target youth to grow our business. that's been the assertion. >> targeting a younger audience happened, and then when juul was called on it they went, oh, sorry, we didn't mean to do that. >> reporter: piper johnson recovered and says she will never vape again. >> it's not worth it and it's not worth the risk and it's not worth, you know, seeing your parents cry as you're in the hospital bed. >> about teenagers.

tony dokoupil spoke to teenagers in new jersey to get an inside look at vaping in the schools. >> reporter: juul, you've heard of it before, i'm guessing. >> yes. >> reporter: how common is it in the school? >> it's hard to tell exactly because kids can sneak around so much. so maybe like 20% about. >> i'd say about the same. >> reporter: you think about 20% of the kids sounds about right to you? >> i would say it's more prevalent among the under class men. freshmen, sophomores and even 8th graders i would say. >> reporter: 8th graders? >> yes. >> reporter: that's young. lauren, sebastian and greg are rising seniors at new jersey's sparta high school. they say they don't personally use e-cigarettes or juul, but have friends who are addicted. what are the symptoms of addiction other than needing it constantly? >> there's a thing called ni krirks sick which they can get, really bad cough, you feel

horrible. >> reporter: secret vape breaks. hall monitors and a school wide system to track bathroom visits. they installed sensors in bathrooms and other locations that can detect e-cigarette vapor. this is a thousand dollars per unit? >> $1,000 per unit. >> reporter: siuperintendent michael rossy said it will send alerts to security and school administrators. a silent alarm? >> correct. >> reporter: the students said they doubt the system will stop kids from vaping. >> they'll learn to doo it somewhere else. >> reporter: they'll beat it, move to a different room? >> if they're knowledgeable of the installation of the system, i think they'll find another place to juul, which would be helpful for those of us who alkly would like to utilize the rest room. but i don't think it will curb the use of juul. >> reporter: you think it will still be 20% for kids this year? >> yes. >> because they'll be able to do

it after school on their own time. >> reporter: they told us about a new plan to curb youth vape sergio garcia, an i.d. verification system that prohibits cashiers from selling to under age shoppers and limits the amounts customers can buy. >> it will be a contributor. reduce and improving, access the availability of people to get products. >> reporter: do you think that will have an impact on how easy it is for kids to get juuls? >> whatever rules get in place people will always find a way to get it like they can easily ask an older friend or whoever it might be. >> it will create another obstacle for kids to jump over. >> most of the kids i know who do it don't twos juul any more. there are disposables. you see them next to the juuls in the convenience store. you don't have to dharj them. once you're done you throw them out. it's 100% not even a juul thing. if juul goes off the deep end, there are these other oneser that using. it's not just juul any more. >> on a lighter note, billy bush is back. three years after his explosive conversation with donald trump

cost him his job, bush gave his side of the story to gayle king. >> reporter: you remember back in october 2016 a recorded conversation between billy bush and then republican presidential candidate donald trump was made public. in that 2005 tape, mr. trump talked about groping women. >> when you're a star, they let you do it. you can do anything. >> whatever you want? >> grab them by the [ bleep ]. do anything. [ laughter ] >> i was not prepared for what happened because it happened, like, so often things do these days, like that. took the car to the airport. got on the plane, and, boom. >> reporter: the boom was you got the news that this tape had been released? >> yeah. >> reporter: and you knew there was a tape? >> everybody did. >> reporter: i didn't. >> well, everybody -- >> reporter: the network. >> yes. >> reporter: the public didn't know. everybody knew about the tape, you're saying. >> yeah. i was comfortable that it wasn't going to be weaponized. >> reporter: um-hmm.

is that how you feel it was, weaponized? >> oh, sure, yeah. i got taken out, but i wasn't the target. >> reporter: so when it comes out, how did you think it was going to end after the tape is released? did you think, i'll get through this? >> i was told that you're good, don't worry about it. it's not you. you didn't say anything. remember, it was leaked on a friday, and then sunday morning i walked out that door right over there with my bags to go back to work, and the driver said, i'm sorry, they've canceled the car. oh, that must be a mistake. i called my lawyer. um, are we okay? he said -- nope. >> reporter: so, let's go back to 2005 about who you were in 2005 and who he was in 2005. >> it was my first year as the co-host of this show. you know, you want people to like you and you're a little leaguer. i became a very different guy. so the guy that got fired, no question was a very different guy. >> reporter: in 2005 did you feel you had to go along to get

along? why didn't you feel you could challenge him and say, you know, that's not cool. why didn't you feel -- >> trump is the kind of guy who would say, forget billy bush and i might have gotten, hey, why did you lose trump? he's the biggest guest we have -- there was always a little bit of you're a little anxious around him because you just want it to end well and get out. >> reporter: you were sort of at the forefront of me, too, before it really started off. >> if i want to like extract like a good thing from the moment, i think it was a tipping point. it was a very hot emotional time, and maybe that was -- helped trigger it. i think it's a good thing. very good. >> reporter: do you feel you're starting over? >> not starting over in the sense -- i think i picked up some missing elements in the last few years, like a deeper empathy. patience. i think people that i'm working with now would say, boy, he's, he's good to work with. i don't freak out if liz, you nerd, cough if you're in here! shhhh. i took mucinex dm for my phlegmy cough.

what about rob's dry cough? works on that too. and lasts 12 hours. 12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill.

ok i'll admit. i didn't keep my place as clean as i would like 'cuz i'm way too busy. who's got the time to chase around down dirt, dust and hair? so now, i use heavy duty swiffer sweeper and dusters. for hard-to-reach places, duster makes it easy to clean. it captures dust in one swipe.

ha! gotcha! twice as much dirt and dust. it gets stuff deep in the grooves other tools can miss. y'know what? my place... is a lot cleaner now. stop cleaning. start swiffering. mudm phy cough. what about rob's dr stop cleaning. start swiffering. works on that too. and lasts 12 hours. 12 hours?! who studies that long?! only mucinex dm relieves wet and dry coughs for 12 hours with 2 medicines in 1 pill. it seems like every day there is a new story of a convicted felon you can being exonerated and set free. he was locked up based on eyewitness testimony that was wrong. erin more yart i introduces us to someone free after 17 years. >> i could never imagine going

home. i thought i was going to die up there. >> reporter: royal clark was 24 years old when he was charged and later convicted of an armed robbery at this burger king in november 2001 in terry town, louisiana. did you rob that burger king? >> man, i didn't know what burger king was. >> reporter: the assailant used a cup seen in this crime scene photo and left fingerprints. but the prints were determined to be unusable. three burger king employees picked clark from a photo lineup, but by trial only one of them, a 19-year-old, was sure. what does that feel like when you know you weren't there and this witness is saying, it looks like him? >> like everything shut down at that moment. everything got quiet. >> reporter: the witness who was the same race as the robber and got a good look at him, convinced the jurors, royal clark was convicted and sentenced to 49 1/2 years.

what was your reaction when you heard the sentence? >> i wanted to pass out. at the same time, i wanted to lash out. >> reporter: clark's appeals were denied and his newborn son grew up without him. how old was your son when you went in? >> my son was like a month. >> reporter: a month old when you were incarcerated? >> taking care of him from the diapers to the clothes to the books, educating him, reading to him, explaining to him life. >> reporter: you missed all of that. >> i missed all of that. >> reporter: and then in 2018, innocence project new orleans took his case. attorney kiahayes poked for dna tested from the cup. there were only usable fingerprints. >> we thought, wait a minute. maybe we can reanalyze the

prints and see if that can find the actual perpetrator. >> my reaction is, do it. i wanted to know. >> reporter: district attorney paul conic's office convicted royal clark. but he agreed to have the sheriff's department's crime lab reanalyze the prints. >> it was a hit. >> reporter: and it wasn't royal clark? >> somebody else entirely that has a history of committing armed robberies in the same area. >> reporter: the finger prints blopged to 54-year-old jesse perry currently in prison for several other armed robberies. paul, when you think about this, what if there hadn't been a hit? in fact, royal clark would still be innocent, but he'd still be in prison. >> that is the tragedy. that is the nightmare. >> reporter: so how did the nes clark get it so wrong? >> unfortunately it happens all the time. >> reporter: nancy franklin, a psychology professor at stone i brook university, specializes in memory. memory, she says, can be altered

by time. what's more, the two men in mugshots have similar features. >> that is a phenomenon called mugshot exposure effect. >> reporter: is it possible this witness was actually remembering the mugshot? >> yes. >> reporter: well, then it makes sense why she would be so confident about pointing to royal clark. >> yes. >> reporter: just how difficult is it to correctly identify a stranger's face? take a look at this man. now choose him in this lineup. >> it's challenging. >> reporter: is the same man one of these ten? >> i'm going to have to go with this one. >> so you're picking 3, and you're misidentifying an innocent person. the right answer is that he's not there. >> reporter: do you think there are other royal clarks in prison right now? >> i'm sure of it. i're >> reporter: j af 42nd birthday, royal clark walked out of prison

with his

365 sharks in the ocean. mark fill indiana pacers got a very personal look. >> reporter: it is a shark captured by marine scientists. wess pratt and nick whitney of the new england aquarium. shark petting is not something you often get asked to do in this line of work. >> he's lovely. >> reporter: the shark is an unwilling part of an annual research study out on the dry or tug as. tiny specs of land 70 miles west of key west, florida. every year like clock work, sharks gather here for their annual under water mating dance. and the scientists gather as well to catch them. >> it's called he stream sight fidelity.

they love this place. >> reporter: this is a what, shark dating bar? >> it is, it's a singles bar for sharks. >> it's the only place in the world you can study shark mating on a reliable base ace. >> reporter: they developed a sly technique moving toward the sharks as they got their minds on something else and netting inou better get right the first time. >> nice. >> reporter: these are nurse sharks, not the most fearsome species, but they can still take a chunk out of you when disturbed. and this is the definition of disturbed. >> a bit rude. >> yeah, we're bulliers, but -- >> somebody has to do it. >> before we started nothing was known about shark mating behavior. this particular species is a window into that world. white sharks, blue sharks, hammerheads all mate like this. >> reporter: and they're all threatened. landed as bycatch by fisherman

and caught deliberately for food in some parts of the world. without enough sharks at the top of the food chain, the rest of the marine world is out of whack. >> so, yes, sharks need our help, they need our understanding. they need our research. >> reporter: technology is helping that research. wes and nick not only tagged the sharks. they attach cameras and instruments that track movement. the devices float to the surface after a few days, revealing whether the animal has found a partner. she's getting a little fed up. the sharks will only stand for all this handling for so long. >> absolutely. some are very calm, and others are less so. we have one that every time we catch has tried to bite me and i named it after my sister. >> reporter: and if catching them is tricky, try letting them go. >> the trick is to get him out of here. >> reporter: anything i should be doing? >> maybe stand back a little bit. >> reporter: there he goes. so it's back to the shark

singles bar. singles bar. in this day and age, with captioning funded by cbs it's tuesday, september 10th, 2019. this is the "cbs morning news." cargo ship rescue. four crew members are back on dry land after being trapped for more than 30 hours inside a capsized ship. the way they signaled for help inside the overturned vessel. controversy controversy grows over government spending at president trump's resorts. how democrats plan to tie the investigation into an informal impeachment probe. and illegal marketing. the claim juul made about its e-cigarettes that led to a warning from the fda. warning from the fda.