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Community and of course, still people on edge trying to figure out where these three cop killers are, but again, we don't have faces to these cop killers, good descriptions, and that's what makes it so difficult. >> it's very interesting because you talk about a time line. they know what happened before and what happened after. that would suggest that they have at least some kind of imij images of the three suspects. they are being very sort of quiet about releasing any kind of forensic information. for example, if there were a struggle there may be some sort of dna, a fingerprint, oil from th...

Have said it's really a he said, he said. unfortunately, one of the participants isn't here to provide his story. of course, george zimmerman doesn't have to testify himself. i think what that clip re-enforces is how forensics will be very much a part of this trial and they will be arguing and they will be disputing blood evidence, meaning position or lack thereof of the blood. the wounds that were sustained, et cetera, et cetera. there will be a lot of aspects of this case that won't be entered through the mouths of witnesses but rather through forensic information. >> very different from the...

Better. that will move the investigation forward at a rate we never would have seen in 1995, or with timothy mcveigh or going forward in 2011. >> it wasn't just the boston marathon. it was patriots' day. do you think that the date might play in the investigation? >> the date, april 15th, tax day, patriots day, the marathon, please be individual dots that investigators will think about. they will be careful to, the media, i include myself in that, now, we want to connect those dots very quickly and say, look. it was pats' day. it might be extremists. these are all individual dots that, at some ...

There more that can be gained if given access by the pakistanis? >> absolutely. and, here, obviously, politically sensitive, but, think of that compound, again like csi, it is a second treasure trove of forensic information, everything from latent fingerprints to fallen hair, with dna and that is a second treasure trove and we need to get access to that as quickly as possible. before it is tampered with or stale, and, even if they have to do it quietly, covertly, the americans need to get into that compound. bill: chad sweet, thanks for coming in, from washington, for the chertoff group, heath...

More information for us. >> recap the facts as we know them. person of interest arrested. they're arrested at jfk international airport. the same individual who traveled to pakistan and recently returned to the united states. described to us as a naturalized american citizen. we confirmed today that investigators were tracking a small pool of suspects and looking at their phone records and there was an international call which piqued their interest. information leaning towards an international... on sunday -- happened i was told that the case was moving quickly because of a larger amount of fo...