In Minnesota, much like other jurisdictions in the United States, the possession or sale of marijuana is illegal. The penalties associated with the crime vary depending on how much of the Schedule I drug that you're found in possession of at the time of your arrest.
As is the case in many other states, crimes in Minnesota are classified as either misdemeanors or felonies. Each one of these has different offense classes that fall under its umbrella. The penalties associated with each crime increase the more serious a defendant's charges are.