Possession of Marijuana in Oklahoma:
Title 63. Public Health and Safety,
Chapter 2 - Uniform Controlled Dangerous Substances Act,
Article 4 - Penalties - Offenses
Section 2-402 - Prohibited Acts B - Penalties
A. 1. It shall be unlawful for any person knowingly or intentionally to possess a controlled dangerous substance unless such substance was obtained directly, or pursuant to a valid prescription or order from a practitioner, while acting in the course of his professional practice, or except as otherwise authorized by this act.
2. Any Schedule III, IV or V substance, marihuana, a substance included in subsection D of Section 2-206 of this title, or any preparation excepted from the provisions of the Uniform Controlled Dangerous Substances Act is guilty of a misdemeanor punishable by confinement for not more than one (1) year. A second or subsequent violation of this section with respect to any Schedule III, IV or V substance, marihuana, a substance included in subsection D of Section 2-206 of this title, or any preparation excepted from the provisions of the Uniform Controlled Dangerous Substances Act is a felony punishable by imprisonment for not less than two (2) years nor more than ten (10) years.
Note: State laws are constantly changing -- contact an attorney or conduct your own legal research to verify state marijuana possession laws.