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Columbia, SC (WLTX) - An employee of the Columbia Police Department's drug lab has resigned after amid concerns over some of the work she did on cases while working for the agency.

Columbia Police Chief William Holbrook announced that Brenda Frazier submitted her letter of resignation to him Monday. Previous Coverage:Columbia Drug Lab Shut Down

Last Thursday, Holbrook shut down the drug lab after concerns were brought to him about Frazier's work by Fifth Circuit Solicitor Dan Johnson. Prior to making the decision, Holbrook had a performance analysis done of the lab's work.

In a memo obtained by News19, Johnson says that review cited several possible problems, including questions about Frazier's training and methodology while doing her job.

Holbrook said Monday Frazier had worked on 746 cases since she was hired in December of 2011, but they're reviewing 188 that they're particularly concerned about. Those cases were done between February and July of this year.

The State Law Enforcement Division is currently handling drug case testing for the city until the problem is resolved.

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