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saint makers. what does it take to become a saint? ask this baptist who used to be blind. >> that's why it's a miracle. his unlikely role in an indiana nun's path to sainthood. revealing investigations, fascinating characters, stories with impact. this is "cnn presents" with tonight's hosts, randi kaye and dr. sanjay gupta. >> good evening. we begin tonight with this unbelievable story of how u.s. soldiers were used as human guinea pigs. during the cold war, the military embarked on this top-secret program to test chemical and biological weapons. >> the researchers used animals, bu...

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...

Once you make that investment you better be committed to going all the way, even if that ultimately leads to some sort of escalation? >> precisely. the fact is a no-fly zone doesn't guarantee anything at all, except that a few aircraft that might be up there in the air might be shot down by our aircraft or allies. we hope without casualties to americans in the process. but having said that, really, the ground action is where the people are being killed. very swiftly, after you're certain the aircraft of libya are gone, at least moammar gadhafi's aircraft, then the hew and cry is there are stil...

Change. difficult to say at this point whether gadhafi's forces are targeting civilians or just targeting, and i use the word just loosely, just targeting armed rebels, and that will be important, won't, it as they come to a decision about what the international community does next. >> well, you know, i think that's right, becky. president obama here in washington has made very clear he wants the international community to be able to act very rapidly if you have this nightmare scenario of the gadhafi forces really opening up on libyan civilians if you start seeing wholesale bloodshed across th...

And we'll talk with a man in tripoli who says he was unarmed and stabbed by libyan police. joining me now jill dougherty in washington, ben wedeman in benghazi, nic robertson in tripoli and professor fouad ajami of johns hopkins university, school of advanced international studies and the hoover institution. jill, first of all, what are you hearing about this report, this possible request coming from a group calling themselves the revolutionary council? >> we have no confirmation of that, anderson. it's obviously coming from the ground or at least people who are directly in touch with those gr...