PharmChem, Inc. manufactures and distributes the PharmChek Sweat Patch, a... PharmChem, Inc. manufactures and distributes the PharmChek Sweat Patch, a product designed for detecting the presence of illicit substances. This patch uses sweat as its sample source, offering an innovative alternative to conventional urine drug tests for identifying cocaine, opiates, amphetamines, PCP, and marijuana. The company is headquartered in Fort Worth, Texas.
