Documents show that the Houston office of the federal agency charged with interior immigration enforcement has stopped investigating individual cases of "sham" marriages, which terrorists have used in the past to stay legally in the U.S. "Due to our current goals, priorities and lack of resources, we will not be participating in conducting one-on-one marriage fraud investigations," Immigration and Customs Enforcement (ICE) Special Agent Gus Meza wrote in an October 2004 e-mail obtained by The Washington Times, citing the direction of supervisory agents in Houston. In another e-mail, an official at U.S. Citizenship and Immigration Services (USCIS), the bureau that...