york city, i'm elaine quijano. this is the "cbs overnight news." welcome to the "overnight news." i'm elaine quijano. the democratic presidential contenders held their final debate of the year. it started off with an apology from bernie sanders. and ended with the candidates showering each other with compliments. things might get more heated in the final six weeks before the iowa caucuses though. our new cbs news battleground tracker shows hillary clinton leading sanders by 5 points in iowa. but in new hampshire it's sanders by 14 points. julianna goldman has more. >> thank you, good night, and may the force be with you. >> reporter: feeling the force behind her, a confident hillary clinton deflected attacks from

o'mally while setting her sights on the republicans, especially donald trump. >> he is becoming isis' best recruiter. they are going to people showing videos of donald trump insulting islam and muslims -- >> reporter: sunday the gop front-runner said those claims are unsubstantiated. >> just another hillary lie, she lies like crazy about everything. >> reporter: instead of personal insults democrats focused on policy disputes. >> our differences are fairly deep. >> reporter: most of the debate covered national security. sanders hit clinton on her 2003 vote to authorize the iraq war. >> secretary clinton is too much into regime change and a little bit too aggressive -- >> senator, you voted for regime change with respect to libya. >> reporter: and on the economy. >> should corporate america love hillary clinton? >> everybody should.

me even less. >> reporter: o'mally, who's trailing in the polls, attacked his opponents on gun control -- >> and it's because of the flip-flopping political approach of washington that both of my two colleagues on this stage have represented there for the last 40 years -- >> whoa, whoa, whoa, whoa, whoa -- >> we need common sense -- >> calm down a little bit, martin. >> reporter: with a simple apology, sanders and clinton did calm a tense dispute over a data breach after sanders staffers accessed clinton campaign voter files. >> we should move on. i don't think the american people are all that interested in this. >> the sanders campaign has suspended two more employees who accessed that clinton campaign data, that's on top of the staffer fired last week. elaine, clinton said saturday night if elected bill clinton would be a key economic adviser but she'd probably still pick out the flowers and china for state dinners. >> julianna goldman in washington, thank you. on the republican side, battle lines are emerging

about on immigration? >> ted was much -- was open. legalizing people that were in he was during the debate on the senate bill. he was after the debate on the senate bill. he made it clear multiple occasions that he was against citizenship but he was open to legalization. and then for weeks now on the campaign trail he's refused to answer that question until the other night at the debate when he said he did not intend to legalize people. again, trying to find himself some wiggle room. and so the bottom line is that there isn't that big a difference between him and i how to approach immigration. that was the point i was trying to make. this is a serious issue and it needs to be confronted and every republican running for president

legalization in some form or fashion of people in this country illegally, even donald trump. he just wants to make them leave the country first then he'll legalize them. >> is it about immigration or are you making a larger charge about ted cruz and whether he's being honest and truthful with people? >> i think ted wanted to not talk about legalization during the primary and leave himself the option of being for it in a general election. obviously i don't think that's fair to the electorate. it's not the first time. there are multiple issues on which he's tried to do these sorts of things. for example, when the free trade agreement was up he wrote an opinion piece in "the wall street journal," he wrote it with paul ryan. three days later he flipped on it. i don't know why, he got some pressure on the fast track authority. he's done it on votes on farm issues. changed his vote on the floor of the senate. there's always some of that. because new facts are presented. i think my concern, if you're going to attack someone on a policy issue, you need to be clear about where you stand on

in the past. >> when voters are making their decision should they be thinking about, what does ted cruz think about immigration? being honest? >> when you spend your time telling people you're a clear talker, you say what you mean, everyone else is a sell-out and you're the only purist, i think second. here's where you've been in the past on some issues and here's where you are now. the republican side supports strong conservative positions. we have differences and we should discuss those. national security, for example. when you run by telling everybody you're the only purist in the field, the only one who's a consistent conservative, then your record is going to have a light shone on it and in this case has proven well after the immigration debate ended he was still talking about how he was open to legalizing people and how important it was to bring people out of the shadows and so forth. >> how much of a national security issue do you think it is there is now an open conversation in the republican party about banning muslims from america and that a majority of the party agrees with that idea? right now do you think that's a national security problem?

people have made, it's not a serious policy proposal. so it was made for the purposes of recapturing the headlines. i mean, donald trump had fallen out of the headlines, rightfully, we had the largest terrorist attack in american history since 9/11. he wanted to get back in the headlines and came up with something spectacular and outrageous so that people would respond to it and he could recapture the headlines. it's not a serious proposal. >> you in a rally in new hampshire said trump is a jerk, a chaos candidate, he's not serious and can't insult his way to the presidency. aren't those all insults? are you trying to insult your way to the presidency? >> no, i'm trying to point out he's not a serious candidate. his answer about the nuclear triad, for example, was mind-blowing. i mean, not having any knowledge about what the subject is, where you have this exclusive responsibility of the president of the united states as commander in chief of the armed forces to know when and how to use our nuclear deterrent. he has no knowledge about this stuff.

saying putin is a strong man and a great guy, when he's trying to destabilize our relationship with our allies. he's not a serious candidate. >> why is the nuclear triad so important, for people who don't understand what that is in a world where islamic jihad is something people are so concerned about? >> it's important because it's been part of the security arrangement that has kept us safe since the post-world war ii era. and we've seen a lack of investment in it and we need to refurbish it and strengthen it. the fact that he wouldn't know what it is, that's one of those questions i think you have to answer in a thoughtful way if you're running for president of the united states. it's not just that. he said isis is not a threat two months ago. he get gets his news from the shows. i know that warms your heart that he wakes up in the morning and gets his foreign policy and military advice from people that go on your show but that's not a serious man. and i don't take -- look. when he insults me personally, i don't take it personally. and he shouldn't take it personally either. but someone needs to call him

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music starts and plays throughout gucci guilty the fragrances for him and for her. the term confidential informant can conjure up images out of a hollywood movie. a police officer going undercover to infiltrate the mob and bring killers to justice. but in reality, many confidential informants are just kids coaxed into working for the police after a minor drug bust. the work can be dangerous or even deadly. the report for "60 minutes." >> how's it going today? >> all right. >> it's your birthday today? >> yeah. >> not what you want to be doing on your birthday, huh. >> reporter: what you're looking at is police footage of the making of a confidential informant. narcotics officer jason webber is recruiting a college student

marijuana sales to become a ci. >> you expressed interest you'd want to help yourself out. >> yeah. >> we're always trying to go up the chain. so what we want to go is have them buy from their supplier or suppliers. >> reporter: webber is the chief of a four-county drug task force in eastern north dakota and western minnesota. how important do you think confidential informants are to your task? >> confidential informants are really important to law enforcement across the country. they make our jobs easier because they are already the ones that know the drug dealers and rely on them. >> most of the kids that you're recruiting are caught for marijuana sales? >> the big majority, yeah. >> reporter: webber's jurisdiction includes the campus of the north dakota state college of science with some 3,000 students. marijuana is now legal in four states and the district of columbia. but not in north dakota. where selling even a small amount on a campus is a class

sentence of 20 years in prison, a fine of $20,000, or both. >> two felonies. >> reporter: this young man andrew saddic was caught on tape by another confidential informant making two sales for a total of $80. webber has called saddic in before charging him to present a choice. agree to work as a ci, wear a wire, and make undercover drug buys from three people, twice each. or be charged with two class "a" felonies. >> potentially the max is 40 years in prison, $40,000 fine. do you understand that? >> yeah. >> obviously you're probably not going to get 40 years. but there's a possibility you're going to get prison time. if you don't help yourself out, yeah, there is. okay? that's probably not the way to start off your young adult life and career, right? >> reporter: saddic took the deal. webber told us most students do. part of the agreement he signed,

himself. >> you can't tell anybody you're working for me. for obvious reasons. >> reporter: an award-winning student of electrical technology, andrew saddic did as he was told. never told any of his close friends about being an informant. never called a lawyer. and didn't breathe a word to his parents, tammy and john saddic. the saddics are a ranching family, still struggling with the dead of their older son in a train accident years earlier, leaving andrew an only child. >> if andrew had told you that he was thinking of becoming a confidential informant what do you think your reaction would have been? >> oh -- well, we'd have gotten him a lawyer and told him no. >> we've never heard of such a thing. he's a college student. snitches, whatever you want to call them, stool pigeons, i don't know what you call them, you know. >> there's no parent i know of child to serve as a confidential informant.

it's too dangerous. i wouldn't want my child to do it. >> reporter: lance block is an attorney in tallahassee, florida, who opposes using young people caught for relatively minor offenses as confidential informants. >> these kids are being recruited to do the most dangerous type of police work, going undercover with no background, training, or experience. they haven't been to the police academy. >> they are basically doing the same work as a trained undercover cop? >> absolutely. >> reporter: block says he was unaware police were using young people as confidential informants until he was hired seven years ago by the family of rachel hoffman, a recent college graduate who was caught with a large stash of marijuana and a few valium and ecstasy pills. it was her second marijuana arrest. >> she was caught by a tallahassee police department and told that if she didn't

prison. >> reporter: she signed up. and a few weeks later was sent out to make her first undercover drug buy. it was to be one of the biggest in tallahassee's recent history. 15 hundred ecstasy pills, 1.5 ounces of cocaine, and a gun. >> had she ever dealt in any of those things? >> no. >> a gun? had she ever fired a gun? >> no. rachel was a pothead. and rachel sold marijuana to her friends out of her home. but rachel wasn't dealing in ecstasy or cocaine, much less of course not weapons. >> reporter: rachel drove her car alone to meet the dealers in this park with $13,000 cash from the police and a wire in her purse. she was to be monitored by some 20 officers. but then the dealers changed the location of the deal, so rachel

staging area, and that's when things went terribly wrong. >> the drug dealers have her out on this road. one drug dealer gets into the car with her. >> and the 20 cops who were nearby? >> they lost her. >> hoffman is 5'7", 135 pounds -- >> hoffman was seen near forest meadows park -- >> they shot her five times when they found the wire in her purse and dumped her body in a ditch 50 miles away. >> reporter: rachel hoffman's tragic death turned block into an advocate. he sued the city of tallahassee and won a $2.8 million settlement for rachel's parents. and he has argued for more openness and greater protection for confidential informants ever since. >> do you have any sense of how many confidential informants there are? >> law enforcement is loaded with statistics. but you cannot find out any information about the number of confidential informants that are being used across this country,

who are being killed or injured -- >> no one's keeping statistics? >> no one. it's a shadowy underworld is what it is. >> we want to make more cases, we want to make better cases that can get prosecuted, informants can do that. >> reporter: brian solis is a longtime undercover narcotics officer who believes a shadowy underworld is exactly what working with cis should be shadowy to protect informants' identity, an underworld because that's where cops like him want informants to take them. >> who knows the most about the dope trade? us, working narcotics? no. who is it? the sellers. the dopers. >> reporter: solis says he's works with hundreds of informants and now trains police officers around the country on how best to use them. >> if you had not been able, personally, to use confidential informants, would you have been as effective?

>> you really feel you need to? >> i know i would not. i may have to watch a house for days or weeks to establish probable cause. my informant goes and makes a buy out of it, i have my probable cause in five minutes. you can get into cases quicker, easier, some respects safer. >> i'm surprised you say safer. because we've heard about kids who have been killed doing these operations. >> it's a dangerous trade that they're involved in. >> yeah. >> they are in that drug trade, they've always been facing that potential danger. >> reporter: he estimates there could be as many as 100,000 confidential informants working with police across the country. he says with just a few win-win. a win for society and a win for the ci. >> they have agreed to do what they are doing in exchange for something. that's the bottom line. when somebody comes to work for me as an informant, it's their decision. >> reporter: police tell us this is completely voluntary and they

the charges. >> it's not something that college kids are standing up saying, i want to be a ci. it's not voluntary, they're being told they're looking at prison time unless they agree to do deals for the police department. >> reporter: and there are some important things they're not being told. >> what if you catch me selling $60 worth of marijuana? what do you say to me to become an informant? >> i'll say, this is the charge. this is a felony. do you want to help yourself out? >> do you tell me that i have a right to talk to a lawyer? >> no, i do not. i tell you you have a right to talk to a lawyer if i'm going to ask you incriminating questions. if we're talking about you becoming an informant, i don't have to tell you that you have the right to a lawyer. >> you can see lesley stahl's

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adele's new cd has only been out for a few weeks but it's already the biggest-selling album of 2015. and when she announced her first north american tour in five years, the tickets went like hotcakes. fans lined up outside ticket windows for hours. others sat by their computers trying to buy seats online. and most of them came away empty-handed. vinita nair has the story. >> tickets went on sale for 56 shows thursday, many in huge arenas that seat thousands of fans.

lengths to keep tickets out of the hands of so-called secondary sellers who buy at retail then jack up prices. tickets are showing up on sites like stubhub for thousands of dollars. hello it's me >> reporter: adele is the reigning queen of heartbreak. now many fans feel her pain. after trying to buy tickets on the phone and online for hours thursday, some received this message instead. no seats available. hello from the other side size >> reporter: memes like this made the rounds on social media. hello from the ticket line. i've clicked refresh a thousand times. at least i can say that i've tried >> people were upset. they were weeping big adele tears while listening to adele music and trying to buy adele tickets.

has sold more than 5 million copies and is the top seller of 2015. the tour sold out and almost immediately tickets were posted on sites like stubhub, premium seats almost $10,000 at madison square garden in new york city. i will wait for you >> reporter: a secondary ticket market now estimated to be worth a reported $8 billion a year. earlier this week the group mumford and sons posted on a blog saying, we want fans of the band to be able to get into our shows for the right price, to see that they've got value for money. adele's team says it worked hard to ensure her concert tickets went directly to her fans. she's one of many artists who work with songkick, the site works to weed out secondary sellers by managing ticket sales through an artist website or fan club. still -- >> virtually everything that has been created to try to shut out scalpers has been conquered by scalpers. >> reporter: adele's management

asked about fan disappointment over thursday's sales. but the singer's manager earlier said they have done everything

many tickets as possible in the steve hartman found a story of christmas kindness on the road. >> i remember kind of just like looking up at the sky and being like, god, are you sure about this? because i'm pretty happy right now. >> did it feel like that, a calling? >> it felt like a calling but i tried to reject it for about two months, it was too outlandish. >> reporter: what eugene felt called to do was one really big random act of kindness. he didn't know who he was supposed to help or how. all he knew was that he had to help someone and it had to be life-altering. and that's when a video came across his facebook page.

met, arthur renowitzki, a paraplegic in a t-shirt with bold letters of bold defiance. after being mugged, shot and paralyzed eight years ago arthur vowed he would walk again someday. when eugene heard about that he called arthur immediately. >> he wasn't going to give up until i was walking again. >> to walk again? >> to walk again. >> you don't have a medical degree? >> i have a film degree. >> which makes you wonder, how were you going to make him walk again? >> this is the part i had no idea. at the time. >> reporter: eventually, though, he learned about this exoskeleton device that can help some people walk again. unfortunately it costs $80,000. to pay for it eugene quit his job at a research company in northern california to hike. from the california/mexico border to canada. >> we're going! >> reporter: along the way he posted videos of the adventure and asked people to donate on social media. until around about mid-washington state -- >> we did it! we did it! >> reporter: eugene learned that he had reached his fund-raising goal. >> you're going to walk! whoo!

>> yes! >> to quit his job. to go into debt from doing this. >> reporter: eugene yun felt called to make a difference in someone's life. but when he heeded that call he had no idea what a difference he'd make. until proof rounded the corner. this is the first time eugene got to see arthur walk. >> oh my god. i'm so happy for you. >> thank you, brother. i call him my brother now. we are brothers. i'm just very thankful to have a friend like him. i wouldn't be here, man, if it wasn't for you. >> reporter: makes you wonder. that little voice eugene heard, was that ever about helping someone with a hardship? or was it about helping two someones with a friendship? steve hartman, on the road in castro valley, california. >> that's the "overnight news" for this monday. for some of you the news continues. for others check back with us a