Relating to the creation of a grant program to assist local law enforcement agencies in testing certain substances suspected of containing delta-9 tetrahydrocannabinol.

HB 4879 creates a state grant program to help local law enforcement agencies test substances for THC concentration. The bill directly affects police departments and sheriff's offices that employ qualified peace officers and agree to have state attorneys review evidence before prosecution. Grants cover costs for personnel, testing equipment, third-party lab services, and record-keeping systems to determine if substances contain THC above 0.3% (the legal threshold for marijuana in Texas). Agencies receiving grants must report detailed data annually, including the number of tests, THC levels found, and case outcomes. The program aims to standardize and fund THC testing while requiring state attorney oversight for prosecution decisions.