DNA expert witnesses may give opinions regarding serology, DNA testing, forensic DNA, DNA fingerprinting, and related matters. This week, the US Supreme Court ruled that police may take DNA samples from people arrested in connection with serious crimes. Justice Anthony Kennedy wrote: “A suspect’s criminal history is a critical part of his identity that officers should know when processing him for detention.”
Slip opinion Maryland v. King: http://www.supremecourt.gov/opinions/12pdf/12-207_d18e.pdf