Alexandria rape suspect challenging DNA search used to crack case

"Elizabeth E. Joh, who teaches policing and technology at the University of California at Davis School of Law, said she thinks legislation is needed to establish limits to law enforcement’s use of DNA.

“There’s very little in the way of rules in terms of what’s permitted and what isn’t,” she said. “It’s still relatively new, and the kind of cases that have thus far been solved are the kinds of cases I think most people want to have solved. But that doesn’t answer the question of what the limits should be on what the government can do.”"