Under existing law, a person commits the crime of unlawful possession of marijuana in the first degree if he or she possesses marijuana for other than personal use or possesses marijuana for personal use only after having been previously convicted of unlawful possession in the second degree or unlawful possession of marijuana for his or her personal use only. This bill would amend the crime of unlawful possession of marijuana in the first degree to provide that a person commits the crime if he or she possesses one or more ounces of marijuana and would prescribe new criminal penalties based on the number of prior violations. Under existing law, a person commits the crime of unlawful possession of marijuana in the second degree if he or she possesses marijuana for personal use only. Existing law also provides that the crime of unlawful possession of marijuana in the second degree is a Class A misdemeanor. This bill would amend the crime of unlawful possession of marijuana in the second degree to provide that a person commits the crime if he or she possesses less than one ounce of marijuana and would reduce the criminal penalty to a violation, punishable by a fine. This bill would also provide that a person who is charged with, found not guilty of, or convicted of unlawful possession of marijuana in the first or second degree may have that charge, finding, or conviction expunged if he or she has not been convicted of a felony, misdemeanor, or violation, excluding minor traffic violations, within the last five years.