Randall Tigue, the attorney for Last Place of Earth owner Jim Carlson, petitioned Monday for Carlson's release prior to his sentencing, which has not yet been scheduled.
Tigue said Carlson has no intention of returning to the sale of synthetic drugs as his shop will remain closed for at least one year.
Late last month, Tigue also filed a motion for a new trial.
The Duluth News Tribune said it's unclear when U.S. District Court Judge David Doty will rule on the motions.
Last Place on Earth was shut down on July 19. Since its closure, police said synthetic drug calls are about one-third of what they used to be and Duluth emergency rooms saw a major decrease in overdose cases.