MCALESTER, Okla. (AP) — A medical marijuana advocate from Colorado is facing a felony drug charge after a traffic stop in Oklahoma that her attorney called unconstitutional.

Regina Nelson, 54 of Boulder faces one count of marijuana possession with intent to distribute, according to the McAlester News-Capital. The Oklahoma Highway Patrol arrested Nelson on Sunday near McAlester after a trooper reported finding marijuana and drug paraphernalia in the vehicle she was driving.

Nelson's 24-year-old son, Bryan Elliott Laufenbert, of Katy, Texas, and fellow advocate Michael Browning, of Boulder, also...