PharmChek® Overlay 

The PharmChek® Overlay is made of the same polyurethane film as the PharmChek® Sweat Patch and can be used to extend the wear time of the PharmChek® Sweat patch.  

Who May Need to Wear the Overlay

Difficulty wearing the patch is most common with:

  • Individuals who exercise heavily.
  • Individuals who perform strenuous labor.
  • Individuals who live in hot, humid climates.

These individuals may produce a large amount of sweat very quickly. Occasionally, the sweat cannot evaporate through the film fast enough, which may cause the adhesive to loosen. The Overlay’s construction allows a larger surface area for excess sweat to be reabsorbed by the body.

Click here to download the Training Manual for the PharmChek® Drugs of Abuse Sweat Patch.

Excerpt US v. Stumpf Decision

"...For the foregoing reasons, this Court finds by a preponderance of the evidence that the PharmChem sweat patch drug testing device is a reliable scientific method for testing for the presence of controlled substances, including methamphetamine, as it was utilized during the periods in question."