Suge Knight will be in jail for a while, because he's now being held with no bail ... and that's because of his criminal past.
Law enforcement sources tell TMZ ... he is no longer being held on $2 million bail because authorities believe he's both a flight risk and more than capable of intimidating witnesses.
As for the flight risk ... it's hard to argue with that. Suge left the scene after hitting 2 people with his truck -- one fatally -- and someone who flees can easily be considered a flight risk.
As for intimidating witnesses ... the L.A. County Sheriff's Dept. convinced the bail commissioner his vast criminal past is evidence enough.