A Weber County evidence room employee has been fired after appearing to be under the influence of “an unknown substance” at work, police say.

A news release from the Weber County Sheriff’s Office said the agency is launching a “full-scale” investigation, and the county attorney’s office is conducting a criminal investigation.

The worker, described as a “civilian nonsworn employee” assigned to the evidence room, has been fired, the release said.

“Multiple steps have been taken to ensure the integrity of evidence located inside of the evidence room,” according to the release.

Sheriff’s office employees are expected to adhere to a “strict” code of conduct, the release said, and such incidents are “extremely rare.” The agency pledged to leave “no stone unturned” in the internal investigation.

While acknowledging the importance of transparency in maintaining the public’s trust, the news release declined to offer additional information on the incident, citing the ongoing investigation.

“We will be releasing more information in the future as the case progresses,” it said.