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he was swapped last year for five prisoners at guantanamo. an army hearing officer had recommended no jail time, but bergdahl now, if convicted, could face up to life in prison. it was three years ago today that a gunman opened fire at sandy hook elementary school in newtown, connecticut, killing 20 first graders and six adults. vice president biden tweeted, "since that nightmare, an estimated 555 children have been killed by guns in america. it is shameful that congress has not acted." as the nation continues to debate gun laws and access to mental health care, newtown parents are reminding us of the urgency. and here's michelle miller. >> we gather here in memory of 20 beautiful children. >> reporter: when the numbers became names -- >> charlotte, daniel...

>> reporter: -- and the names became faces, suddenly they were america's children. 20 first graders gunned down in their classrooms along with their teachers. >> it's always 12:14. it is always the last day that they went to school. that's never going to change. >> reporter: but something had to change for nicole hockly, who lost her six-year-old son dylan. >> this is about not accepting this. we can't just passively sit back and say, "these shootings happen." >> reporter: together with other newtown parents, she helped found sandy hook promise, a group working to prevent gun violence. >> i can still feel him. i can smell him. i can hear his little voice. >> reporter: mark barden also lost his six-year-old son daniel. >> in almost every one of these mass shootings, there are signs and signals. there are opportunities to intervene to stop that continuum before it leads to tragedy.

>> reporter: together they travel the country teaching others how to respond to those signs. they call it the say something campaign. if you see someone at risk, say something. that training worked recently in cincinnati when a student reported someone plotting an attack. >> the whole thing was stopped and diffused. >> reporter: did the hairs... >> oh, yeah. >> i burst into tears. >> it was overwhelming. >> to actually know we potentially saved lives, that means something. >> reporter: and so does sweeping gun legislation they helped pass in connecticut two years ago. it expands the ban on assault weapons and limits the number of rounds per magazine. but the campaign has had its setbacks. with the defeat of a bill two years ago that would have closed loopholes in background checks for gun buyers. a lot of people say, if it didn't happen with newtown, when will it happen?

>> it is happening. >> sandy hook was the start. it was a catalyst for change. it's too late for us, but there's a lot of other positive change for this country that will come. >> reporter: change that will keep a promise to the children of sandy hook. michelle miller, cbs news, new york. >> we have been bringing you a variety of opinions on how to curb gun violence, from gun rights to gun control. tonight we continue our series, "voices against violence." >> i'm tom farley, the former health commissioner for new york city, and now the chief executive officer for an organization called the public good projects. let me put the problem of gun violence into perspective. think of the most horrific mass shootings in american history. newtown, 26 people killed, virginia tech, 32 people killed, and we lose that many people to gun violence every day in america.

on an average day in america, 31 people are killed with gun homicides, and 58 people shoot themselves with guns. this isn't just a law enforcement problem, it's a public health problem. homicides and suicides are the number-two and number-three causes of death in young people and teenagers in america today. those people aren't being killed with viruses. they're being killed for the most part by bullets. the gun is, after all a machine, a mechanical object that causes injuries, like a car, and car crash deaths in this country have dropped by more than half since 1980 by a public health approach with safer highways and safer car design. we can take a public health approach to design safer guns and put in other public health policies to reduce gun deaths, as well. we need a much more thorough process for background checks. you can undergo a more thorough vetting if you want to adopt a cat from a shelter than to get a gun. if you can reduce the number of guns in america, we can prevent an awful lot of those shootings. >> former new york city health commissioner tom farley.

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mucinex fast max. the only cold and flu liquid gel that's max-strength and fights mucus. let's end this. the skies are getting crowded with drones. so today, the federal government said they'll have to be registered. transportation correspondent kris van cleave shows us how that will work.

>> reporter: when the f.a.a. registration website goes live next monday, current drone owners will have two months to register. newly purchased devices will have to be registered before taking flight. >> i think this does add a level of seriousness to the operation of the drone. >> reporter: former faa assistant administrator scott brenner. do they need to have a drone registration program? >> i think the faa was struggling with how do we educate new users, and by creating this registry, now we have a direct link to every user, which will allow us to do a tremendous amount of education. >> reporter: the faa hopes that education will prevent more close calls in the air. a new report identified 158 incidents in the last two years where a drone came within 200 feet of another aircraft. 28 times the pilot had to take evasive maneuvers. there has never been a confirmed collision between a drone and another aircraft. the new registration system will require drone owners to give their name, mailing address and e-mail and pay a $5 fee.

>> i think some will not want to pay that fee. >> reporter: lawyer michael drobac works with the drone industry, which has been supportive of a registration system. does having the registration system make the skies safer, do you think? >> do i think those who would act in an inappropriate manner, do i think they will register? probably not. >> reporter: the faa will waive that $5 fee for the first 30 days. scott, all operators will be given an identification number that has to be displayed on their drones. >> kris van cleave, thanks very much. still ahead, the bully poultry. why the mailman has to walk swiftly and carry a big stick.

today, bill cosby filed suit against seven of the women who have accused him of sexual misconduct. they are suing him claiming he defamed them by trying to brand

them as liars. in his countersuit, he says they are "trying to assassinate his reputation." more trouble today for americans who make a living in the oil patch. shell says it will cut 2,800 more jobs. shell's total for the year comes to 10,000 layoffs. oil closed today at $36 a barrel, down nearly $25 since may. 18 months ago in the summer of 2014, it was $105, nearly three times higher. stocks closed higher. the dow gained 103 points. on cape cod it's not foul weather that stays this courier from the swift completion of his rounds, it's just plain fowl, as in turkeys. the letter carrier carries a pole to keep the birds at bay. not clear why they follow him. perhaps they're looking for "mail" companionship. we're not looking for a stamp of approval on that last line.

after the diplomatic breakthrough, the sounds of havana are playing in chicago. ,,,,,,,,,,,,,,

today president obama said he is very interested in visiting cuba, but not until cubans are given more freedom. it was one year ago this week that the u.s. began restoring diplomatic ties that were severed half a century ago. and dean reynolds tells us that has led to a musical breakthrough. >> reporter: for this ensemble of young, cuban jazz musicians, better relations with the united states sound like this. ♪ performing for the first time on american soil at chicago's auditorium theater, 24-year-old conductor ernesto lima says there is a message in their music.

>> well, the improvisation is freedom of the music. >> reporter: so improvisation is freedom. >> yes, i think so. >> reporter: their concert was a year in the making, and the dream of the chicago jazz philharmonic's artistic director orbert davis. >> we have to think about the people, the musicians, the culture. music is everybody's and it's what they value. if they can trust us with that, they'll trust us with other things. >> reporter: we first met davis and these students a year ago in havana. 21-year-old wendi galvez has been playing violin since she was seven. >> billie holiday, ella fitzgerald, those are my gods. >> reporter: wendi, ernesto and the rest of the students study music here, where the residue of jazz left over from america before the castro revolution still echoes through the instruments. ♪ dizzy gillespie's 1947 "manteca" is one of the best examples of

the two nation's musical collaboration before fidel castro closed jazz halls and took over clubs like the famous tropicana. the u.s. embargo that followed created another challenge. you don't have the best-quality instruments. >> no, because we don't produce instruments in cuba. >> reporter: so this is not a stradivarius? >> no. [ laughter ] >> reporter: which made their performance on this night all the more remarkable. do you think music is a universal language? >> yes, if you don't know how to speak english, but when you are playing, you understand everything. >> reporter: with music there is no language barrier. dean reynolds, cbs news, chicago. ♪ >> and that's the overnight news for this tuesday. for some of you, the news continues. for others, check back with us

just a little bit later for the mong news and of course, "cbs this morning." from the broadcast center in new york city, i'm scott pelley. this is the "cbs overnight news." welcome to the "overnight news." i'm don dahler. with the holidays right around the corner, president obama is trying to assure americans that their celebration also be safe. one week after his oval office address on terrorism, the president made the rounds of his security agencies. at the pentagon, mr. obama insisted u.s. intelligence has uncovered no credible threat of an attack over the next few weeks, and he said the u.s. military is taking the fight to the islamic state in both iraq and syria. >> this fall, even before the revolting attacks in paris and san bernardino, i ordered new actions to intensify our war against isil. these actions, including more

firepower and special operations forces are well under way. this continues to be a difficult fight. as i said before, isil is dug in, including in urban areas and hide behind civilians, using defenseless men, women, and children as human shields. even as we're relentless, we have to be smart, targeting isil surgically, with precision. our partners on the ground are rooting them out block by block. that is what this campaign is doing. we are hitting isil harder than ever. coalition aircraft, our fighters, bombers, and drones have been increasing the pace of their strikes. last month in november, we dropped more bombs on isil targets than any other month since this campaign started. we're also taking out isil leaders one by one, going after them from their strongholds in downtown raqqah to libya, where

we took out the isil leader there. the point is, isil leaders cannot hide, and our next message to them is simple -- you are next. every day, we destroy as well more of isil's forces, their fighting positions, bunkers, staging areas, heavy weapons, compounds and training camps. many places isil has lost its freedom of maneuver, because they know if they mask their forces, we will wipe them out. in fact, since this summer, isil has not had a single successful major offensive operation on the ground in either syria or iraq. in recent weeks, we've unleashed a new wave of strikes on their lifeline, their oil infrastructure, destroying hundreds of their tanker trucks, wells, and refineries. and we're going to keep on hammering those. isil also continues to lose territory in iraq. isil had already lost across

kircut province and tikrit. more recently, isil lost at sinjar and baiji, where its oil refinery. we saw a daring raid supported by our special forces which rescued dozens of prisoners from isil, which master sergeant joshua wheeler made the ultimate sacrifice. so far isil has lost about 40% of the populated areas it once controlled in iraq. and it will lose more. iraqi forces are now fighting their way deeper into ramadi. they're working to encircle fallujah and cut off supply routes into mosul. these are areas where isil is entrenched. our partners on the ground face a tough tight ahead, and we're going to continue to back them up with the support they need to ultimately clear isil from iraq. >> the president's strategy is playing out on the front lines in northern iraq. although isis still controls

vast territory, their offensive to overrun the kurds has been stopped in its tracks outside mosul. charlie d'agata took a news crew there. >> reporter: in many ways it was a routine assignment. head out to the front lines and see how kurdish peshmerga forces are holding up against isis. we got to within a half mile of isis territory and man, did we witness how deadly and determined this enemy can be. >> reporter: even when colonel badal bandi told us his forces face isis attacks every day, we didn't expect this would be one of them, until he showed us where three suicide car bombers tried to charge their outpost at dawn. his soldiers were able to kill the drivers before they detonated their sboifs. but two car bombs remained there

not more than 50 yards away posing a deadly throat to the troops. here on the front line, the bomb squad is a .50-caliber gunner. he fired rounds into one vehicle until it went up in a plume of smoke. he then opened up on the second car. we watched from a bunker hole until finally, a direct hit. [ explosion ] that noise you can hear is debris raining down on top of us. shrapnel from the bomb and twisted remains of the week fwloen sky high after the explosion. everybody's ears were ringing. but the next sound was laughter. it's happier ending when car bombs blow up on the other side of the front line. we are up close to one of those huge car bombs, you realize how

disruptive they can be in civilian areas and why they are the most feared isis weapon on the battlefield. attacks like these are happening every day. another component of the u.s. strategy is to cut off funding for the islamic state. the treasury department says isis makes about $40 million a month, just selling oil. so that's become a prime target. elizabeth palmer reports. >> reporter: u.s. and coalition planes have now begun to bomb tankers full of oil sold by isis in syria. part of an effort to cut off an estimated $40 million a month the group makes from petroleum sales. and in the cynicle economics of war, some of that oil even goes to president assad's government, isis' sworn enemy. most of the oil fields in syria are in isis controlled territory. once pumped, it's moved by tanker to be sold locally, to buyers in regime controlled

syria or iraq and turkey. the coalition began bombing isis refineries last year and the russians have now joined in, choosing oil related bombing targets. that may have made a dent in isis' ability to supply oil clean enough to be used, but it didn't stop it. matthew phillips is with bloomberg. >> we overestimated really the damage that we did, the long-term damage and underestimated their ability to kind of adapt to that. >> reporter: syrian locals simply set up crude refineries, basically cooking the oil in 3i89s bf selling'9" to traders who get it to market. attacks on what are isis operations like this will inevitably till innocent civilians. one more thought while cutting off revenue is going to hurt isis, it won't bring the group to collapse. the best estimates say isis is

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the republican party holds round five in its series of presidential debates tonight. this one in las vegas. donald trump will be front and center with ben carson on his right and ted cruz on his left. new jersey governor chris christie was a late add. a des moines register poll of likely iowa caucus goers shows cruz leading by ten points with just seven weeks to go before the caucuses. nancy cordes reports. >> reporter: this is the second poll in less than a week to show cruz leading the gop field in iowa. the trump campaign trashed the poll, while trump himself chose to trash cruz, saying he's unfit for the job. >> i don't think he's qualified to be president. >> reporter: donald trump had

this message for gop leaders who might think his support in awhat is waning. >> i don't go down, i go up. i'm going to win. >> reporter: and he went after his sometimes ally ted cruz after promising for weeks he wouldn't. >> you look how he's dealt with the senate where he goes in there like a maniac. >> reporter: on twitter, cruz crushed off the comments. ♪ maniac posting a link to this 1980s clip to the song "maniac." cruz refrained from attacking trump. >> i like donald trump. a lot of our friends here have encouraged me to criticize and attack donald trump. i'm not interested in doing so. >> reporter: nationwide, the real estate mogul still has a big lead, beating cruz by nearly 20 points in the latest cbs news/"new york times" poll. still, his willingness to take on both sides of the washington

establishment resonates with iowa conservatives. >> the way republican leadership punishes anyone who stands up to the cartel -- >> reporter: that approach has made him unpopular with leaders in his own party. brian walsh worked to elect republicans to the senate in 2010 and 201. >> he would be equally problematic. >> reporter: why? >> if we're going to win in 2016, we need to expand the electorate. we need more females and hispanics. instead of learning those lessons, you have candidates like cruz and trump who are doing the opposite. >> meanwhile, trump's comments on banning muslims from entering the united states is becoming a drag to his business interests overseas. julianna goldman reports from washington. >> reporter: donald trump has made his fortune in part by

plastering his name around the world from washington, d.c. to istanbul, people have bought into the trump brand as a symbol of luxury and success. but with each new controversy, more and more business partners are severing ties. these high rises in turkey bear the name of donald trump. some who work inside trump towers in istanbul say the building's namesake has given them reason to quit their jobs. this 20-year-old sales consultant said trump should close the building. there are muslim people working here. this is affecting me in an unfavorable way. this week, a major middle east retailer, with 190 department stores, stopped selling the trump home decor brand. in stanford, connecticut some in the muslim community are calling on the developer to strike trump's name from this high rise. and at this trump residence in new york city -- >> it's embarrassing to have his name on the building.

>> reporter: gordon gray with the u.s. chamber of commerce said he can't calculate the damage to trump's reputation in the muslim world. >> he gets the nomination, that prolong s his exposure in the public eye. >> reporter: since he declared his candidacy, trump's rhetoric may have had a cost. after his cost about mexican immigrants, more than a dozen companies from macy's to the pga and nascar severed ties. >> those are small in his empire compared to his real estate fortune. he has several projects in the muslim world. it's very hard to quantify the consequences exactly, because it's not just deals he may or may not lose, it's deals that you don't know he may or may not

have gotten. so that's always the big question mark out there. >> reporter: trump's own financial disclosures don't break down the dollar amount of each investment, but forbes estimates that last year trump brought in about $128 million in branding and licensing fees. in other news tonight, dog flu. there's a new strain this year, along with a new vaccine to fight it. but as molly hall reports, the shots are expensive and may not be necessary. >> reporter: veterinarian katie grib says a new strain of canine flu that started in chicago last spring is spreading fast and has proven deadly for some dogs. >> this type of the virus progresses so quickly, it moves into the lungs, causing severe pneumonia. >> reporter: the united states department of agriculture has approved a new vaccine to address the epidemic. it's being shipped to

veterinarians right now. >> it's a totally novel virus. dogs don't have -- u.s. dogs don't have any historical experience with this virus. therefore, they have no protective cross reaction with any other antibodies that they've formed in the past. >> reporter: since the epidemic began, more than 1500 dogs became ill in a few months. at least eight died from secondary infections. the strain has now spread across the country. the new strain is different from the common dog flu, which already has an effective vaccine available. in some cases, two vaccinations might be necessary. the old shot can cost up to $90 for two rounds. the vaccine for the new strain costs double that. >> if your dog is in close contact with other dogs very frequently, then it's extremely important to be thinking about and talking to your vet about

doing this vaccine series. >> reporter: veterinarians don't know how effective the new vaccine will be. they hope down the road, a shot will be developed that covers both strains of flu. for now, check with your vet to see how common each flu is in your area. (beat begins)

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glasses to see through walls. researchers at m.i.t. are making real breakthroughs in the technology. it's a story i first reported for "cbs this morning." step on the campus of m.i.t. and you're likely to get a glimpse of the future. there are drones and plenty of robots. and another with a soft enough grip to handle an egg. some of the most recent breakthroughs, however, are happening here at the university's computer science and artificial intelligence lab. where this simple looking box applies a complex set of algarhythms. >> this shows the ability if tracking people through walls. >> reporter: dina is the professor leading the project, dubbed emerald. which has this ph.d. student

demonstrating a wireless technology. so he's not wearing anything special? it's just picking up his movement through the wall? >> yeah, no cell phone, no sensor, no pendant. it's purely based on how the signal reflects off our body. >> reporter: what was the inception for this? >> we work on wireless networks. the question is, can we use this for purposes other than communication? can you sense the environment with it? >> reporter: it not only detected his position in the room, but his elevation from the floor. >> you want to see the red dot fall? >> reporter: yeah, let's see the red dot fall. researchers hope it can protect seniors at risk for falling. >> when it detects a fall, it

sends a message to the caregiver. >> reporter: that's just scratching the surface of emerald's capabilities. it hones in on his vitals, respiration and heart beat. >> being able to get the heart rate, wow, it's that sensitive. >> reporter: and it's not in any way as dangerous as say constant exposure to x-rays would be? >> no, not at all. i tell people all the time, the technology is the same carrier as wi-fi. it's actually 10,000 times or more lower power than wi-fi. so if you're not worried about wi-fi in your home, you shouldn't be worried about this. >> are there any privacy concerns about this, like maybe a burglar can use this to see where you are in the house?

>> basically like with any new technology, it comes with a challenge. as society discovers new technologies, there are rules and laws a person has to abide by. >> if you look at that over there -- >> reporter: after more than three years, the m.i.t. team demonstrated their work for the president last summer. what was his reaction to this? >> so i think when he saw the breathing and heart rate, he said, wow. >> that potentially has applications for baby monitors. >> reporter: the goal now is to take it to people's homes within the next year. if you and your partners have this great invention that has huge promise, do you stay a professor or become a businesswoman? >> is there a reason not to be both? >> reporter: is there enough hours in the day to be both? >> i have 24 hours a day. i don't even track holidays. i don't know that there is a holiday. i come to the lab and my

students say oh, yeah, it's a holiday today. so i think there are plenty of hours as long as a person is interested in what they are doing. and having a great team like i have here. >> they also point out that first responders could benefit a great deal by knowing exactly where people are in life threatening situations. >> we like her. i like that she kind of told you, yeah, she can do it. i can be both. >> i just ask the questions. >> and i think it's good seeing through the wall, because i was concerned that you could physically see like if someone was walking around naked. >> it's like sonar. >> and do with that information what you will. >> thank you. >> got to go. [ laughter ] >> this is new information for me.

>> you know what? the news is back in the morning. what can we say?,,,,,,,,,,,,,,,,

wisconsin has a state pastry called the crinkle and it's a big hit. >> reporter: in racine, wisconsin, the holidays are all about the kringle. there's certain skill involved in making the wisconsin state pastry. good lord, that's a lot of dough. it takes lots of this. to make the dough flaky. then you have to do this, again and again, to make the 36 layers. does everybody do this much by hand? >> as far as i know. i think we're the last ones. >> reporter: for four generations, benson's bakery has been mastering the technique.

>> you can see the layers. >> reporter: when the benson family opened its bakery 81 years ago, they followed the danish tradition of a pretzel shaped pastry. complete with a kringle queen and kringle inspired polka. originally the danish pastry had an almond filling with raisins. now ben, jr. and his son, ben iii, make close to 30 flavors. >> my grandpa, until he died, would say, just keep the quality and you'll be here forever. i'm still here. >> reporter: not far from benson's is this danish bakery, family run since 1949. >> that looks good. >> we make our own fillings here. >> reporter: the owner took us on a tour of his 39,000 square

foot facility. daily, they make 5,000 to 7,000 kr kringles. >> in the 1950s, some of the bakers started shifting them as a gift. so the word kind of spread. >> people come here because we have kringles. >> reporter: at larson's bakery, they combined techniques rolling the dough by machine. don hutchison's father bought the bakery in 1969, and he says a kringle from anywhere else just isn't the same. >> you can't get a new york bagel anywhere else, because they put the time and labor into making it right. >> and that's "cbs overnight news" for this tuesday. for some of you, the news

continues. for others, check back with us later for the morning news and "cbs this morning."""hi ♪ . >> it's tuesday, december 15th, 2015. this is the "cbs morning news." >> the republican candidates square off one last time. while donald trump will be center stage the surging ted cruz will get extra attention from voters and trump. an unarmed man shot by police as he tries to escape from a wrecked vehicle. why the officer isn't facing charges by the driver is. hotel workers dive for safety when a pickup truck