believe has zimmerman uttering a racial slur. we did our own enhancements earlier, but have now used more sophisticated methods to uncover the truth. zimmerman's two attorneys are speaking out about why neither one has actually sat down and looked their client in the eye. they spoke to local station wofl. >> for an ongoing investigation, there are cases where i want to sit down and look in my client's eye. i understand the police have given him a voice-stress test. he passed that. the evidence seems to support his version, so i don't necessarily need to look him in the eye. >> that's something new. george zimmerman taking a voice stress test. sanford police won't comment on whether they put him through such a test when they questioned hip, but they do say they use it, as do other florida police departments. keeping them honest, how reliable are they? we contacted an expert who did a study of the devices when used to question suspects about drug use. he says their ability to detect deception is, and i'm quoting now, no better than flipping a coin. again, we don't know whether the sanford police department subject the zimmerman to such a test, nor if they used it as a basis for not charging him. we do know the lead investigator had suspicions about his story. now, the mother of a 13-year-old witness to the incident says that same investigator told her so. >> the lead investigator from the sanford police department stood in my family room and told me, this was absolutely not self-defense, and they needed to prove it. he told me, and i'm paraphrasing this quote, but read between the lines. there are some stereotyping going on here. >> that's the mother of a young witness on msnbc. the 911 tape of george zimmerman's call as he was pursuing trayvon martin through the gated community he was patrolling. we should warn you. you're going to hear some strong language. you might want to send your kids out of the room. the two words you'll hear are an expletive and some believe a racial slur. when the question first came up we worked with a top audio expert to enhance the tape. >> rick, can we play just that second word, what we think the second word is and hear if that sounds any different? >>. [ inaudible ] >> it certainly sounds like that word to me. although you just can't be sure. that sounds even more like the word when it was the f word before there. >> that's correct. >> it seemed pretty clear then, but since then we've been able to use a higher tech method to isolate what was sides that night. here again, gary tuckman. this is brian stone, one of our senior audio engineers. expert in this field. you've enhanced the tape and we're going to listen to it. i have not listened to this. because i wanted to listen to it for the first time on this equipment. let's play it. >>. >> are you following him? >> yeah. >> we don't need you to do that? >> that certainly sounds much clearer than the first tape we listened to. >> some are accusing george zimmerman of using the racial slur coons in his 911 call. it was preceded by the f word. >> the problem is, this is very short, about 1.6 seconds. so once again, if we can repeat it a few times so we can hear it clearly. [ unin telligible ] >> it's apparent the first word is a curse word. so we'll bleep it out for the rest of the story. it's the second word that's important. >> i don't want to say what it sounds like, but let's play it a few times so the viewer can have an idea for themselves and draw their own conclusion. >> cones, cones, cons. >> now, it does sound less like that racial slur. i acknowledge it could have been that slur from listening in this room, it doesn't sound like that slur. it sounds like we're hearing the swear word at first and the word cold. and the reason 134 say it would be relevant is because it was unseasonabley cold that night in florida. so some zimmerman supporters are saying that. >> it does to me. and i have not heard this. >> first time you've heard this? >> yes. >> can we play it a few more times? >> sure. >> cones, cones, cones. >> so the key is to get rid of the wind and anything broadband noise. >> that's what we've done this time as compared to last time. >> this reduces and cleans up a lot of broadband noise. >> does it change the voice or a word? >> no, it would not change a word. >> just makes it clearer? >> yes. >> can you play that for us one more time? >> cones cones. >> this is the clearliest audio we've heard of the 911 call, but it's apparent there will still be controversy over what he said. >> joining me now, police veteran lou pallum bow who runs a private security firm. also joining us jeffrey tubein and criminal defense attorney mark ger ag os. it's a major issue as far as the justice department is concerned, that word, whether it was a bad word or simply saying it was cold. f 'ing cold. presumably they wouldn't get involved if the word was cold. >> the only way the federal government has jurisdiction over this homicide is if they can prove there was racial hostility at the core of it. a simple shooting is a purely state matter and then the federal government wouldn't be involved. there may be other evidence in the case. this is obviously very important, but not the only piece of evidence in the case. the justice department will investigate every aspect, but certainly if the word is cold, not co-o-o-nc-o-o-n, that is re. >> it's an important point, 100%. can it be cleared up? >> i don't know anything's ever 100% in the criminal justice system, but this is precisely what they do. they go to an audio specialist, enhance it, the term that we use in the court. once they've enhanced it and gone through it, then everybody listens to it and tries to figure out, okay, he said it or he didn't say it. as jeff says, it's true. if there was a word that that's used that is racially charged, that is going to tend to kind of make their decision a lot easier. if there isn't, they will look at the surrounding circumstances. we saw what happened with the nbc enhanced tape or edited tape. and if that doesn't play out, and it looks like it hasn't played out, then it makes it a much toucher decision for them to file a case federally. >> this is also a good example of why it's important to take your time. i remember when gary tuckman did his first report and i sat here with anderson and i thought i heard co-o-o-c-o-o-n. this definitely sounds like cold. again, everybody wants this case to be wrapped up tomorrow. this just shows why it's important to say, let's get the best evidence we can. >> today we learned zimmerman was given a voice stress test. tell us about it. is this admissible useful? >> not admissible the same way a polygraph isn't. it's a measure of stress in your voice. they examine micro tremors in an attempt to determine truthfulness. i don't particularly give it much credence. i think there are some people that do. i think what really happened here, this attorney has opened up a can of worms to suggest that we take a full battery of tests, including a polygraph and have it administered by someone like the fbi. i didn't realize the sanford police department -- and i do want to say this. 43 states have adapted or adopted this means of screening or determining a case. the fbi and the cia also use this. i don't think they use it for resolution in criminal matters. they probably use it more for the purpose of screening candidates or if they have a confidential informant that's giving them a lead. >> it's like a lie detector test, but it's not necessarily all that reliable and certainly is not admissible. mark, let me bring you back into the conversation. we understand that in florida, when you're arrested, the clock starts ticking to bring someone to a speedy trial. you're required to bring them to trial within 180 days. could that explain why charges have not been brought against george zimmerman? >> there are speedy trial rights in every state. the thing here, and i haven't determined it and i'm not an expert in florida law whatsoever, but it order to me initially, one of the reasons why they may not have -- and mind you, everybody was first reporting that he had not been arrested by any stretch of the imagination. that tape shows that he was under arrest. what then triggers is it whether or not you have to take him to a magistrate within a certain period of time. whether you have to take him directly and within a certain number of hours. there is u.s. supreme court precedents and here in california, you'd have to get him in front of a magistrate in two to three days. otherwise the case would be rejected. i do not think, in this case, came to play. >> they have that pressure and they want to do frankly what most criminal defense lawyers would like to see a prosecutor do, analyze the case, interview the witnesses, make sure before you file something that you've actually done all of your home work and they're got the luxury to do that now. >> we'll see what happens. >> they didn't do that in the prior two weeks, everybody insisting this case be taken a look at. for two weeks, this case basically sat there on the back burner. until the pressure was exerted by the public, no one was looking at this case. >> they are looking at it right now. thank you very much for coming. let us know what you think. we're on facebook and google plus or follow me on twitter at wolf blitzer cnn. i'll be tweeting tonight. a day after his three-state primary sweep, mitt romney has resumed his attacks on president obama who's giving as good as he's getting. how do their claims about each other stack up to the facts? 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take this line from governor romney on the recession. >> i've said many times before, the president did not cause the economic crisis. but he did make it worse. >> keeping them honest, when president obama took office, the economy was in free fall. 4.5 million jobs lost in president bush's last year and 4.3 million jobs lost in the early obama administration. as you can see job losses slowed. then gains started to appear and grew. for march, the economy is expected to add about 200,000 jobs. that means as of february, the economy under president obama had gained back about 3.2 million of those 4.3 million jobs lost during his administration. according to a cnn money survey of economists, all 4.3 million jobs lost on his watch could potentially come back by year's end. all on the economy, there's this claim about the administration's economic recovery. >> the $787 billion stimulus included a grab bag of pet projects that languished in congress for good reason, for years. it was less than jobs planned and the mother of all earmarks. the administration pledged that their stimulus would keep the unemployment rate below 8%. it's been above 8% every month since. >> he's certainly right about the last part. unemployment is now at 8.3%, up from when president obama took office, but down sharply from its peak of 10.1% in october of 2009. as for the stimulus, they say it increased employment, created jobs by anywhere from about a million to as many as three million jobs. as far the claim that the administration pledged to keep the jobs number under 8%, it comes from an estimate, not a pledge, in a report writen by two top obama economic advisers during the transition back in january 2009 shortly before the president took office. moving on to the president's speech, no outright false hoods, but not always the whole truth. take this on government regulation. >> you'd think they'd say, you know what, maybe some rules and regulations are necessary to protect the economy and prevent people from being taken advantage of by insurance companies or credit cards companies or mortgage lenders. >> it is true governor romney wants to repeal the law, tightening regulations on the financial industry, however, he's also said as recently as last night and i'm quoting him now, we of course understand in a free market that regulations are necessary and critical. there's also this about health care reform. >> there's a reason why there's a little bit of confusion in the republican primary about health care and the individual mandate since it originated as a conservative idea to preserve the private market place in health care while still assuring that everybody got coverage, in contrast to a single. payer plan. now suddenly this is some socialist overreach. >> on this the president is right. the individual mandate was originally a conservative idea, even had some conservative support, by the way, while the obama health bill was being drafted. listen. >> i believe that there is a bipartisan consensus to have individual mandate. >> that was senator charles grassly of iowa on fox news. a leading conservative supporting the mandate at the time it was being drafted. however, keeping them honest, it's a mandate that president obama opposed when running for office. here is his drawing a contrast back in the 2008 debate with then presidential candidate hillary clinton, who unlike president obama, supported the mandate. >> clinton's plan and mine is the fact that she would force in some fashion, individuals to purchase health care. >> joining us now, republican strategist and former george w. bush secretary of state ari fleischer and democrat poster who currently works for president obama's re-election campaign. cornel, it seems as if, as far as the obama campaign is concerned, the republican primary is over. at least that's the impression you're giving. what do you think? >> well, i think pennsylvania will have a lot to say about that. it keeps going along. santorum wins a couple. romney wins a couple. but i think he's not at the magical number yet. however, i think for democrats, it's really about whether it's santorum or romney, they're all sort of cut from the same radical cloth in the same policies, all back being the same policies that in our mind would undermine the middle class. they're all for the ryan budget plan and taking power away from women and give it to their employees to make health care decisions for them. so whether it's santorum or romney, they all have to answer for their policies. >> you've seen recent poll numbers in states that are critical. disappointing numbers for romney. is he emerging as a weaker or stronger candidate? >> i'll answer that in a second. but it first it saddens me when people talk about americans as being radicals. we can have political differences left and right, but i don't call anybody a radical on the left. i've never used that for barack obama and i think it's one of the reasons we're starting to fray at the seems. we should be cautious of the words we use. >> let me let cornel respond to that. >> well, i responded to him. so we're even. >> when you look at some of the policies that are being put forth bite ryan plan that does away with medicare p something that our seniors have been depending on for years, i would argue that that's radical. when you're trying to give power back to wall street to write their own rules and do the same things that got us into that mess, some of us look at that and say that's radical. this is not the republican party of a decade ago. this is a different sort of republican. >> here's the pb with that wolf, the barack obama of eight years ago is the one who said, there is no red america, no blue america, he's the united states of america. now he's the one out there calling people radicals. you can disagree is still love this country and not be a radical. that is what is so divisive about the language that president obama and his pollster are using, it feels like wir always fighting instead of working it out. >> a lot of republicans call the president a socialist. the rhetoric on both sides can be intense. >> number one, i have haven't. number two, i don't believe mitt romney who is all but definite republican nominee. so if there are people on the side, idcall them out on it too. >> good for you. is romney a stronger candidate or weaker now? >> he is weaker and he's running against a weaker president. one of the factors going on, this republican primary has not strengthened the front-runners. you can make the case it's brought them down. the same thing happened to president obama. he began his presidency with a 10% disapproval, increased five times now, under 50% in disapproval. so his presidency hasn't served him well. the republican primary hasn't served republicans well, and the american people are in a bad mood about almost everybody in public life. it's a warning to everybody. >> cornel, your team had a lot of fun pointing out mitt romney's weakness with the conservative base. but you look at some exit poll numbers, and he seems to be making real progress with a lot of voters. >> well, i'm going to pull a ari here and respond to ari. when you go back to 2008 and look at how the battle between hillary and then senator obama, as the process went on, voters didn't start to dislike the then senator barack obama more. they didn't. they didn't start to dislike him more. you're now looking at a nominee in romney who's under water. he starts off in a weaker position than most candidates and quite frankly, you just don't want your candidate starting off under water when by the way we haven't really begun spending money to even attack him. so it's definitely different than what it was in 2008. you certainly don't see new people coming in and wanting to join the process like you saw in 2008. so i think it's fundamentally different. >> guys, thank you very much for coming in. >> thank you. >> we have breaking news we're following tonight. the l.a. coroner has just released the final autopsy report for whitney houston, and there are new details about the role cocaine played in her death. americans believe they should be in charge of their own future. hothey'll live tomorrow. for more than 116 years, ameriprise financial has worked for their clients' futures. helping millions of americans retire on their terms. when they want. where they want. doing what they want. ameriprise. the strength of a leader in retirement planning. the heart of 10,000 advisors working with you one-to-one. together for your future. ♪ the los angeles county coroner has released the final autopsy report on whauft's death. from the preliminary report, we already knew the singer's death was ruled an accidental death with cocaine cited as a contributing factor. the final report says she drowned in a tub of hot water about 12 inches deep. it also describes a white substance on the counter with a spoon. dr. drew, this report is a pretty grim accounting of the final hours of her life. you've gone through it. how serious of a report is this? >> wolf, the shocking thing about this report, and i want to assure you that i have a complete