About PharmChem, Inc. PharmChem, Inc. ("PharmChem") (OTC: PCHM), headquartered in Fort Worth, TX, is the manufacturer and sole source provider of the PharmChek® Drugs of Abuse Sweat Patch. Safe Harbor for Forward-Looking Statements FORT WORTH, Texas, July 21, 2025 /PRNewswire/ -- PharmChem, Inc.("PharmChem" or the "Company") (OTC: PCHM) the leading provider of sweat patches to detect drugs of abuse, today announced that the Company has entered into a definitive agreement to be acquired by Alcohol Monitoring ...