Businesses are raising concerns about the North American Free Trade Agreement, from what they see as an outdated employee visa program to political wrangling over the deal to potentially break down trust with Mexican and Canadian trade partners, immigration and labor attorneys said Thursday. Luis Campos of the Haynes and Boone law firm in Houston, addressed these and other concerns raised by business clients during a gathering at Rice University's Baker Institute to discuss NAFTA's future. He acknowledged that the visa program, which authorizes free travel for trained personnel in 60 professions, fails to account for several new jobs created over the two decades NAFTA has been on the books.