As this public radio show discusses, DNA from pets is increasingly being used to help solve crimes.  Investigators can take DNA samples found at a crime scene, such as hair, and have it tested to match a victim’s pet.  A match can link a perpetrator to the crime if, for instance, the DNA of the victim’s pet shows up on the assailant’s clothes.  As noted on the show, the field of veterinary forensics is growing, and while the DNA testing is expensive, it can make a big difference in solving a case.  In addition to animal DNA, plant DNA and viral DNA has also been used in criminal cases.