be seen with the help of another machine. the laser would trace the dna. that s what you re going to see here. reporter: it s a unique readout called a dna fingerprint. to solve the case that fingerprint can be added to or matched in a federal database including some 14 million different profiles. hair saliva urine, semen, all these can be used. reporter: seemingly small clues picked up at crime scenes. he says a piece of crust can yield millions of cells or even just a few. sometimes that s just enough to identify a suspect or even solve a case. alexandra field, cnn, new york. pizza crust. now that daron wint is behind bars and police believe he did not act alone, they re looking for anyone who helped him commit these crimes. what are police looking at now? i can tell you that d.c. police are continuing to hunt for more suspects who allegedly
identification lab at mount sinai hospital in new york city. a single bite mark can be enough to crack a case. swab the pizza to get as much dna from the crust. reporter: investigators lightly tested a crumb. first a machine separates out the dna. then the sample is amplified. millions of copies made to make the sample large enough to be seen with the help of another machine. it s called a dna fingerprint. to solve the case that finger sprint can be added to or matched in a federal data base including some 14 million different profiles. hair saliva urine.
he says a i thinkle bite mark can be enough to crack a case. swab the pizza to get as much dna from the crust as we can. reporter: investigators likely tested a crumb. put it in a tube. get the cells out and proceed to dna extraction. reporter: first, a machine separates out the dna. this is releasing the dna? and purify the dna. reporter: then the safrple is amplified, millions of cop police made that make the sample large enough to be seen with the help of another machine. thely as wore trace the dna and that s what you re going to see here. reporter: it s a unique readout called a dna fingerprint. to solve the case the finger print can be added to or matched in the database including you 14,000 different profiles. hair saliva urine, semen, all can be used. reporter: seemingly small clues picked up at crime scenes a piece of crust can yield