The Los Angeles County Sheriff's Department will retest more than 4,000 DNA samples after announcing it used a faulty testing kit for at least eight months.

The Los Angeles County Sheriff’s Department said this week it will retest 4,000 DNA samples and open an internal investigation after learning that it used potentially flawed test kits for eight months.

About 4,000 DNA samples will need to be retested after the Los Angeles County Sheriff’s Department realized it was using faulty tests for eight months. The department announced the error in