Michigan bills look to tighten the definition of marijuana ANNA LIZ NICHOLS, Associated Press/Report for America May 27, 2021 FacebookTwitterEmail LANSING, Mich. (AP) — Legislation to close a gap in Michigan marijuana law that has allowed some untested products similar to marijuana to be sold passed Thursday in the state House. The legislation would include all THC products in the legal definition of marijuana, therefore subjecting all such products to the same level of testing, regulation and restrictions. THC is the main compound in cannabis and marijuana products that gets users high. The scientific name for THC is delta-9-tetrahydrocannabinol, so when Michigan looked to include THC in its laws it explicitly said “delta-9-tetrahydrocannabinol."