United States v. Taylor, 322 F.,3d 1209 (9th Cir. March 20, 2003)(trial court erred in refusing to dismiss accessory after the fact conviction that was predicated on same facts that supported defendant's conviction for aiding and abetting, because the government's theory was that the defendant was an accessory after the fact because he did not turn himself and the principal in after the crime was committed would mean every principal is also an accessory in his own crime when he doesn't turn himself in, which would be an "absurd" result).
http://caselaw.lp.findlaw.com/data2/circs/9th/0110104p.pdf