Now it appears that Mueller was in DC on jury duty at the time of the alleged assault.
“Robert Mueller dutifully doing his jury duty in D.C. Superior Court on Monday. The FBI director (with an ear-pieced security guy in tow) made it all the way into the jury box for voir dire on a gun-possession case and got a warm smile from the judge ... but he was quickly excused (the “work in law enforcement?” question seemed to do it).
By The Reliable Source | August 3, 2010; 1:00 AM ET”
http://voices.washingtonpost.com/reliable-source/2010/08/hey_isnt_that_robert_mueller_r.html