OKLAHOMA CITY (AP) — Some GOP lawmakers are taking steps to ban billboards that advertise medical marijuana, further limit where dispensaries can be located and make Oklahoma's medical pot program more transparent.

Those lawmakers filed bills ahead of the Feb. 3 start of the legislative session, The Oklahoman reported, even though the legislators who passed last year's "Unity Bill" that established a legal framework for State Question 788, indicated they don't want sweeping changes to the medical marijuana program this year.

Sen. Mark Allen introduced a measure that would ban medical marijuana...