The legislature did not write an unconstitutionally overbroad definition of "adulterants and dilutants," which allows the State to include the entire contents of a toilet bowl in determining the punishable weight of methamphetamine seized from a defendant. Health & Safety Code §481.002 defines the criminal offense of possession of a controlled substance with sufficient clarity and in a way that prevents arbitrary and discriminatory enforcement. Ex parte Kinnett, No. AP-75,611.