United States v. Lucio, ___ F.3d ___ (5th Cir. Oct. 12, 2005) (conviction under 18 U.S.C. 922(g)(5)(A) [possession of firearm by undocumented noncitizen] upheld since undocumented noncitizens immigration status remains unlawful during the pendency of an application to adjust status; mere fact that he has received permission to work in the county does not alter the initial unlawfulness of his immigration status).
http://caselaw.lp.findlaw.com/data2/circs/5th/0420331cv0p.pdf