 After leaving the CIA in 1989, Marcinkowski joined the Prosecutor's Office in Oakland County, Michigan where, as an executive staff attorney, he established the first special prosecution unit for domestic violence.In 1993, Marcinkowski abruptly left the office, refusing to cooperate with the criminal probe of another assistant prosecutor who was arrested in a gambling raid.He then publicly accused his former boss, Prosecutor Richard Thompson, of corruption and demanded an investigation by Michigan Attorney General Frank Kelly.