Lonnie David Franklin Jr. appears for arraignment on multiple charges as the alleged "Grim Sleeper" killer, in Los Angeles Superior Court Thursday, July 8, 2010. (AP Photo/Al Seib, Pool) When California authorities arrested Lonnie David Franklin, Jr. as the suspected “Grim Sleeper” serial killer last week they based their case in part on a DNA match of crime scene evidence to a sample from his incarcerated son —  a relatively new and controversial technique critics say raises ethical and legal questions that need to be examined by legislators. Police had forensic evidence from the crime scenes, but no match to suspects in the FBI’s ...