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New system provides faster results for DNA tests

  • Senior Criminalist Steven Crotti of the Department of Justice and Criminalist Tanya Kauffman extract DNA using a liquidator last week in Richmond. (Kent Porter / Press Democrat)

It used to take months for Sonoma County detectives to receive test results from DNA samples collected during examinations of rape victims.

But Sonoma County is one of six counties in the state benefitting from a pilot program at a DNA laboratory in Richmond that uses a new method to extract and analyze DNA samples. Since 2011, it has reduced the turnaround time to an average of 15 business days.

This month, sexual assault victims in Lake County began having access to the swift analysis — called the Rapid DNA Service.

“It's going to be incredible, the turnaround,” said Crystal Martin, child abuse and sexual assault advocate with the Lake County District Attorney's Office Victim-Witness Division.

The state launched the pilot program in 2011 in Sonoma, Napa, Marin and Solano counties and has since included Santa Barbara and San Luis Obispo counties, said Michelle Gregory, a spokeswoman for the state Department of Justice. Lake County joined this month and the state is evaluating expansion into Mendocino, Del Norte and Butte counties.

The program has fundamentally changed how DNA evidence is handled in sexual assault examinations in the six counties.

Evidence from every sexual assault victim who undergoes an exam in the six counties is immediately sent to the state lab. Previously, police did not submit samples from all cases. Samples that were deemed critical were sometimes sent to a local lab first, slowing the analysis.

Since Sonoma County joined the program, state criminalists have been able to extract 50 DNA profiles from 146 sexual assault exams in Sonoma County. Twenty-four have been linked to suspects through CODIS, the Combined DNA Index System, a searchable database of more than 2.1 million DNA profiles submitted in California. Nationally, the database contains the DNA profiles of more than 10.4 million offenders.

Sonoma County District Attorney Jill Ravitch said that 14 local convictions since 2011 were aided by “hits” in the DNA database.

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