Justin Bieber -- DUI Plea Deal Offered ... No Sizzurp, No Weed

Justin Bieber has become the next contestant in a high-stakes game of Let's Make a Deal ... and door #1 is JAIL. Door #2 is way better, but he has to be sober.

Law enforcement sources tell us ... the Florida State Attorney has offered Justin a plea deal in his DUI/resisting arrest case ... and we know the terms.

Prosecutors will DROP the DUI and resisting arrest charges, but in return Bieber must:

-- Plead no contest to reckless driving

-- Complete 40 hours of community service

-- Attend an alcohol ed course

-- Attend a "victim impact panel" (where relatives of DUI victims share their stories)

-- Install an ignition interlock device for 3 months

Now here's the rub. Prosecutors also want Bieber to submit to random drug testing, and not just in Florida. He'll have to submit his travel plans to the court and authorities will set up random testing wherever he happens to be ... at his expense. And testing will last between 6 and 9 months.

Assuming he complies with all the terms and PASSES the drug tests, the reduced plea will formally be entered.