The Los Angeles County Sheriff's Department will retest about 4,000 DNA samples after discovering some exam kits used last year and in early 2025 might be prone to "intermittently poor performance ...

FILE - A roll of police tape is left on the windshield of Los Angeles County sheriff's vehicle in the parking lot of its training academy in Whittier, Calif., Wednesday, Nov. 16, 2022.

After using defective DNA testing kits for eight months, the Los Angeles County Sheriff's Department said it would review its recent criminal cases and thousands of samples. The agency's ...