OKLAHOMA CITY (AP) — Oklahoma's Board of Health overstepped its authority with several of the emergency rules on medical marijuana it adopted last week, Oklahoma Attorney General Mike Hunter wrote Wednesday in a letter to the head of the agency.

In the letter to Interim Commissioner of Health Tom Bates, Hunter specifically cites last-minute changes the nine-member board approved last week that prohibit the sale of smokable marijuana and require a pharmacist at every dispensary.

Those rules were recommended by groups representing doctors, pharmacists and hospitals, but were fiercely opposed by...