I've got a part-time job looking for brand viagra Although drawing DNA from human hair, saliva, or blood samples has long been established part of crime scene investigations, animal material has also provided investigators with valuable clues. The Veterinary Genetics Laboratory at the University of California, Davis has used animal DNA to catch criminals for more than a decade — including in one case in London in which blood left at the scene of a nightclub stabbing was matched to a murder suspect's bull terrier.