"Employment in the marijuana industry may constitute conduct that violates federal controlled substance laws," the USCIS said.
The rapper was charged in October with misdemeanor counts of reckless endangerment and assault in connection with an attack on two bartenders.
The judge said Daniel Frisiello, who is developmentally disabled, would not respond well to prison but stressed the sentence wasn't "lenient."
The alleged incident involved a 15-year-old wrestler, but few details have been released as authorities wait for other possible victims to come forward.
Bronfman faces a maximum of 25 years in prison but the government's sentencing guidelines suggest 21 to 27 months instead.