Immigration officials held U.S. citizen for two weeksAn ACLU attorney showed authorities his birth certificate and other documents to obtain his release.By Anna GormanOctober 28, 2008Federal authorities have released a Los Angeles man from immigration detention after acknowledging that he is a U.S. citizen.Guillermo Olivares Romero, 25, was held at an Otay Mesa detention center from Sept. 25 until