Montana voters approved the legalization of cannabis for all adults 21 and older. Now comes the hard part: Implementing the law and opening the new stores. (Joshua Titus for Leafly) In the two months since Montana’s adult-use cannabis legalization bill was voted into law, speculation has swirled that conservative state legislators intend to rip it to shreds. As the state Legislature opened its session last week, that opposition didn’t take long to appear. Right out of the gate, Republican state Rep. Bill Mercer stripped a $1.35 million request to fund a marijuana regulatory agency out of a House appropriations bill.