And although this is a fire scene, it is also a crime scene, which means a large unit of crime scene investigators is present, working from a tent at the corner of West St. and Liberty. (p. 194)
NYPD Detective first grade Hal Sherman: "At Ground Zero the CSU is responsible for photographing the site, recovering physical evidence, documenting body parts and any other physical evidence like weapons or a wallet, manning the temporary morgue at the site (as well as the city morgue up on 28th Street), inspecting debris that leaves the site, and inspecting debris as it gets sifted out at Staten Island. ...All evidence is documented– airplane parts were essential to the beginning investigation, but now they look for hair, fibers, glass particles, semen, ballistics. ...We ID every part.