Harris County sheriff's officials say initial test results were wrong and flyers found on patrol cars and other vehicles were not tainted with fentanyl.
Authorities said in a statement Friday that an initial test done on a flyer found Tuesday by a sheriff's sergeant who later felt ill resulted in a positive finding for the opioid painkiller known to be more powerful than heroin.
But further testing was later done in a laboratory on 13 flyers, the sergeant's clothing and other samples. All proved negative for the drug.
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The sergeant had reported dizziness, impaired vision and other symptoms after removing the flyer from her patrol car. It's not clear what caused her to become ill.
The flyers promoted a group whose website includes claims that the government is controlling individuals through microwave beams.