Kiefer Sutherland on L.A. Prosecutors Radar

We've learned the L.A. City Attorney has contacted the NYPD for all their info on that Kiefer Sutherland headbutting incident last week.

Kiefer is on probation for a DUI conviction in L.A. One of the conditions of probation -- he must obey all laws. The City Attorney could go back to the judge and ask that Kiefer's probation be revoked and that could potentially mean some serious jail time -- around 11 months max.

The City Attorney hasn't made a decision yet.