Melendez v. Gonzales, __ F.3d __, 2007 WL 2713121 (9th Cir. Sept. 19, 2007) (a noncitizen may not obtain a Lujan expungement for immigration purposes on a second offense were the noncitizen has already been given "pretrial diversion" treatment on a prior offense, even though "pre-trial diversion" does not require the noncitizen to enter a plea of guilty to a controlled substances offense).