WI SB499

Redefines "hemp" to require total THC concentration (including tetrahydrocannabinolic acid) of not more than 0.3% in the plant on a dry weight basis, eliminating the current allowance for higher federal limits up to 1%

Excludes from the definition of "hemp" any hemp-derived cannabinoid products containing synthetic cannabinoids, cannabinoids manufactured outside the plant, or quantifiable amounts of THC or cannabinoids with similar effects

Creates new category of "industrial hemp" covering hemp grown for stalks/fiber, seeds/grain/oil, microgreens from immature plants, research purposes at higher education institutions, and seed production for these uses

Excludes viable cannabis seeds exceeding 0.3% total THC concentration from the hemp definition, treating them as controlled substances

Updates testing and certification requirements throughout Wisconsin statutes to reference "tetrahydrocannabinol" instead of "delta-9-tetrahydrocannabinol" to reflect the broader THC measurement standard