Do the police need a warrant to arrest me?

The general answer is no: police do not need a warrant to arrest in Minnesota. In order for the police to lawfully arrest you they must have probable cause that a crime has been committed. Probable cause is more than a mere suspicion that a crime has been committed but it is much less than the evidence required to convict for the suspected crime. The exception to this general rule is if the police seek to arrest someone while in their home. In such cases a judicially approved warrant must be obtained prior to the arrest.