Pop quiz: Which population group represents the largest segment of undocumented citizens in the U.S.? The correct answer would be U.S. citizens, more than three

out of four of whom don't possess valid passports. That little known fact stands to become a big problem next summer when the rules change and U.S. citizens are no longer allowed to re-enter the country from Canada or Mexico by simply showing a birth certificate and driver's license. Fewer than 25 percent of Americans hold a U.S. passport, including a third of adult women whose proof of citizenship does not even reflect their current legal name, says Kathleen Campbell Walker of El Paso 's Brown McCarroll, the immediate past president of the American Immigration Lawyers Association. "Many U.S. citizens already face significant hurdles in providing valid proof of citizenship, and the need for that documentation is only going to increase," Walker says. To interview Kathleen Campbell Walker about immigration and documentation issues, contact Barry Pound at 800-559-4534 or barry@androvett.com.