Stacey Koon

Stacey Koon -- the former LAPD sergeant who went to prison for his role in the Rodney King beating -- has been charged with DUI ... TMZ has learned. Law enforcement sources tell us the L.A. County District Attorney's Office formally filed charges against Koon after he was arrested in May. He's…

Stacey Koon -- the former LAPD sergeant who did prison time for zapping Rodney King with a taser -- has changed careers -- he's now driving a limo. An independent photog got Koon driving a limo for Music Express, the high-end private transport company. Koon, who was leaving LAX, scoffed at the…