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You can say that zimmerman threw the first punch. you can say that trayvon martin was pulling away and that's when he was shot. you can construct a scenario where zimmerman is the aggressor, even though he's on the bottom. but that's, i think, it's a tough sell. >> and sunny, that's not where the prosecution started out this trial doing. >> not all the witnesses are saying that george zimmerman was on the bottom and trayvon martin was on the top. there are several witnesses that say they saw george zimmerman on top. that's one thing. the other thing is you have to look at what the prosecution ...

And initiated this confrontation, it's tough to argue that you concede that trayvon martin is on top. it's not impossible. you can say that zimmerman threw the first punch. you can say that trayvon martin was pulling away and that's when he was shot. you can construct a scenario where zimmerman is the aggressor, even though he's on the bottom. but that's, i think, it's a tough sell. >> and sunny, that's not where the prosecution started out this trial doing. >> i think everyone is really looking at this the wrong way. first of all, not all the witnesses are saying that george zimmerman was on ...

ability to silence the press? >> saint makers. what does it take to be a saint? ask this baptist that used to be lying? his unlikely in a path to sainthood. fascinating characters. stories with impact. this is cnn presents with tonight's host, randi kay and sanjay gupta. >> good evening. we begin with this unbelievable story of how u.s. soldiers were used as human guinea pigs. during the cold war they embarked on the program to test chemical and biological weapons. >> the researchers used animals but believe it or not, also humans and volunteer who is had no idea what they were signi...