On the eve of the season-opening Daytona 500 last month, NASCAR suspended Busch indefinitely after a family court commissioner in Delaware found Busch "more likely than not" committed domestic violence against his former girlfriend Patricia Driscoll.
The commissioner's report was in support of a no-contact order he awarded Driscoll, who alleged she was physically abused by Busch during an incident in his motor home at Delaware's Dover International Speedway on Sept. 26.
Busch denied the allegations and unsuccessfully appealed his suspension.
He then agreed to follow a set of recovery guidelines from NASCAR, which were not disclosed, to be reinstated. And after Delaware prosecutors said last week that they would not pursue criminal charges against Busch, NASCAR lifted the suspension.