Except as otherwise provided in this subtitle, a dealer or other person may not: knowingly participate in the illegal sale, rental, transfer, purchase, possession, or receipt of a regulated firearm in violation of this subtitle; or knowingly violate § 5–142 of this subtitle. A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 5 years or a fine not exceeding $10,000 or both. Each violation of this section is a separate crime.