Study probes DNA search method that led to 'Grim Sleeper' suspect

The state of California has been a leader in the use of familial DNA searches -- investigations that seek out crime suspects by taking unidentified crime scene DNA, looking in a state DNA database for people who are partial matches to that sample, and then track down those close relatives of the suspect to help chase down the ultimate target. A familial DNA search helped police nab 'Grim Sleeper' suspect Lonnie Franklin Jr. in 2010.

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