May a Border Patrol agent working in the primary inspection lane of an interior immigration checkpoint extend the immigration stop beyond the "brief question or two and possibly the production of a document evidencing the right to be in the United States" permitted by United States v. Martinez-Fuerte, 428 U.S. 543, 558 (1976), without reasonable suspicion of an immigration violation or other crime, to allow time for a Border Patrol service canine to complete a free-air sniff of the vehicle?

May a Border Patrol agent working in the primary inspection lane of an interior immigration checkpoint extend the immigration stop beyond the 'brief question or two and possibly the production of a document evidencing the right to be in the United States' permitted by United States v. Martinez-Fuerte, 428 U.S. 543, 558 (1976), without reasonable suspicion of an immigration violation or other crime, to allow time for a Border Patrol service canine to complete a free-air sniff of the vehicle?