SAN FRANCISCO (AP) — An Alabama man was charged this month with the 1980 murder of an Oxnard teen. A Placerville man was arrested last month for a 1986 rape and murder of a San Mateo teen. A San Francisco man is currently on trial for the murder and robbery of a tourist two decades ago.

Technological advances in genetic research and computers in recent years have turned solving “cold cases” into near-routine police work. The California Attorney General reports that the state’s DNA database of close to 2 million samples spits outs more than 425 “hits” a month, more than double the average monthly rate of 183 in 2008. More than 10,000 suspects have been identified in the last five years.