Nina Bernstein has a series of articles this weekend in the New York Times, available online with this link to the agency fraud worksheet used by U.S. Citizenship and Immigration Services and a blog item titled: Could Your Marriage Pass the Test? She reports that of 20,507 petitions filed in the last fiscal year by U.S. citizens seeking green cards for their foreign spouses, 7.2 percent were denied for various reasons.
See: Do You Take This Immigrant? (June 11, 2010); and Wed in 1993, But Stuck in Immigration Limbo (June 13, 2010).