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Michigan. since both murder victims had been sexually assaulted and investigators had dna of the killer, they wanted to know whether it was gorton's dna. so they put gorton under a 24-hour surveillance. they followed him to a local roller skating rink where he took his children. undercover officers watched gorton eat pizza and drink soda from a styrofoam cup. when gorton left, an officer rushed to the table, confiscated gorton's cup and took it to the forensics lab. the sample was tested immediately. >> dna is like any other biological molecule, subject to degradation. and one of the things th...

>> in the yard, investigators found the projectile that passed through shaw's body. this along with the two inside shaw's body were sent to the forensics lab. under a microscope, firearms expert chris henderson discovered that the lands and grooves on two bullets were the same. the third bullet was different. >> we determined that we had two different shooters based on the class characteristics of the bullets. >> in their search for potential suspects, police had to consider whether rosana shaw had anything to do with her husband's murder. ron's grown son from his first marriage certainly thou...

To see if it's possible it could be the second bomb. in the first picture they say you can see a bag up to a mailbox, up against the barricade along the marathon route. in the second, which they blurred because it's very, very graphic, there is no sign of the bag. that from our affiliate whdh, the fbi now investigating these photos to see if in fact that is the bag that contained the bomb with the pressure cooker device. fran, let me bring you back in. assess what whdh is now showing is this. >> well, wolf, what will happen is, the fbi, in particular, and forensics lab at quantico will take th...

Street, they are readily available. i would rather go for the jewelry. to get rid of and i would rather go into a home where there isn't a gun because i don't want to run the risk of running into the homeowner. >> every home i have broken into, live on tv, there are always guns, we do take jewelry, we take laptops, that facilitates, financial theft. we take prescription drugs, anything of value that's laying around. guns are a mairnt priority because they are easy to turn. you can take an $800 handgun and sell it for $400. you can grind down the cereal number. a good forensics lab can pull tha...

>> reporter: not really. what people are asking for is the process. they feel the process was circumvented from the very beginning because this was a seven-hour and 50-minute investigation from the time of a shooting to the time of a decision that he would not be charged with a crime. i've spoken with veteran detectives in florida who have handled cases like this. and they're dumbfounded to think this would happen so quickly, if for no other reason than for the forensics. trayvon's -- the clothes that he was wearing would have gone to the forensics lab for gun powder. the autopsy report could ...