What Drugs Are Illegal in Minnesota? Minnesota law prohibits possessing, selling, and manufacturing many controlled substances.The MN Judicial Branch has created a video to explain the criminal expungement process, including how to fill out the forms, service, and filing. Fill out the free and confidential form below with some brief details of your charge so we can review the details of your drug charge. A person may seek an expungement of a drug charges in which the person received a statutory stay of adjudication for 4th or 5th degree drug possession cases. Minnesota makes it illegal to possess a controlled substance without a valid prescription. Penalties vary according to the class and amount of the drug. Facing drug-related charges in Minnesota? Contact Our skilled drug crimes defense lawyer to confidently defend against drug charges. A 5th degree controlled substance offense is usually charged as either a felony or a gross misdemeanor, you must speak with a lawyer as soon as possible.