A Harris County sheriff’s sergeant was treated for possible fentanyl exposure after coming into contact with a flyer on Tuesday.

Flyers had been played on some windshields in an area of town that tested positive for the opioid fentanyl, according to the HCSO Twitter account. They advised persons to call the authorities if they see specific flyers from “TargetedJustice.com.”

Motorists were asked to avoid the 600 block of Lockwood while haz-mat crews treated vehicles for possible fentanyl contamination.

No further information was available of Tuesday afternoon.