An investigations supervisor with the Pinellas County Sheriff’s Office was arrested Sunday on a charge of driving under the influence.

Deputies found Samantha Krenek about 6:20 p.m., driving an Infinity sedan “at excessive speeds” north on U.S. 19, just south of State Road 580. The car was swerving in and out of lanes, according to the Sheriff’s Office.

Deputies stopped Krenek, 37, who was alone in the vehicle and identified herself as a Sheriff’s Office employee. Her eyes were bloodshot and watery, deputies said, and her breath smelled of alcohol.

Krenek failed field sobriety tests, including a breath sample, which found her blood alcohol concentration to be 0.28. According to Florida law, a driver is considered impaired at 0.08.

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She was placed under arrest and transported to Pinellas County Jail. She is charged with one count of driving under the influence.

Krenek was hired by the Sheriff’s Office in 2005 and had been working as a child protection investigation supervisor. In accordance with agency policy, she was immediately fired following her arrest, deputies said.

Contact Megan Reeves at mreeves@tampabay.com. Follow @mareevs.