'Anarchy' Star -- No Charges in Cop Assault Case

10/2/2010 4:20 AM PDT
TMZ has learned ... "Sons of Anarchy" star Mark Boone Junior is officially in the clear over an incident in which he allegedly attacked a cop back in August.

As we previously reported, Boone -- real name Mark Heindrich -- was originally pulled over for a routine traffic stop in Glendale, CA -- but allegedly got physical with the officer.

Now, law enforcement sources tell TMZ the L.A. County District Attorney declined to prosecute Mark on Thursday -- after an investigation determined there was insufficient evidence to prove he was guilty beyond a reasonable doubt.