By Tracy Clemons
St. Louis (KSDK) - Within the last few weeks, one female Saint Louis Zoo employee claimed something had been put in her soda, and one male employee complained something had been slipped into his coffee.
The zoo had both drinks tested.
A zoo spokeswoman tells us those tests showed no foreign substance in the woman's soda.
But tests did show the man's coffee had a miniscule amount of motor oil in it.
The zoo wouldn't provide an on camera interview, explaining this as a personnel issue.
However, it did give us a brief statement about its two employees: "One went home before we could offer her medical testing. The other, we took immediately to medical testing and he had no ill effects.
We've been talking to the staff and the Department of Health, and we haven't found any evidence of tampering."
Officials say the female employee has since resigned.
We asked the Zoo spokeswoman whether she had any idea of how the motor oil got into the man's coffee. She says they don't know because it was only left alone for a minute or so.
She also says they've conducted an extensive investigation and haven't uncovered any wrongdoing.