ST. LOUIS (AP) — Missouri won't have enough demand for medical marijuana to support the number of businesses the state is required to license by next year, according to a new study.

Three University of Missouri researchers recently told state officials that Missouri will need fewer than half of the 60 commercial growers that must be licensed by January, the St. Louis Post-Dispatch reported.

At most, 29 cultivators could grow enough marijuana for what researchers estimate could be 26,000 qualified patients by 2022, according to the report commissioned by state medical marijuana regulators.

The...