actually play in identifying this man? cnn s alexandra field visits an evidence lab to learn how authorities were able to find wint with a pizza. reporter: it s potentially the smoking gun, a pizza box found at the scene. inside crust that investigators say connects daron wint to a heinous crime. this is a good find for an investigator. exactly, yeah. reporter: dr. david zang runs a dna identification lab in new york city. he says a single bite mark can be enough to crack a case. swab the pizza to get as much dna from the crust as we can. reporter: he says investigators also likely tested a crumb. put it in the tube. get the cells out and proceed to the dna extraction. reporter: first, a machine separates out the dna. purifying the dna. reporter: then the sample is amplified. millions of copies are made that make the sample large enough to
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.
now i have as and bs. in washington, d.c. police released four people with dar.winter when police arrested him for the murders of sava valve vap poll louse, his wife, amy, their 10-year-old sop and the housekeeper. wint is in jail today, charged with those murder bus police believe he did not act alone and they are still searching for suspects combing through the evidence found at the krim scene. here is now is cnn s alexandra field. reporter: it is potentially the smoking gun, a pizza box found at the scene, inside crust that investigators say connects darren wint to a heinous crime. this is a pretty good find for an investigator. exactly. yeah. reporter: dr. david zang runs a dna identification lab at mount sinai hospital in new york city.
daron wint is being held without bail for the murders of the d.c. family found tide up and burned in their d.c. mansion. how the key piece of defense, a pizza crust led to the suspect. reporter: it is potentially the smoking gun, pizza box found at the scene. inside crust that investigators say connects daron wint to a heinous crime. this is a pretty good find for an investigator. yeah. reporter: the doctor runs a dna identification lab at mount sinai hospital in york city. he says a single bite mark can be enough to crack a case. swab the pizza to get as much dna from the crust as we can. investigators also likely tested a crumb. put it in the tube. get the cells out. proceed to the dna extraction. reporter: first the machine separates out the dna. releasing the dna from the