Mexican trucks are rolling over the U.S. border, freely bound for anywhere in America, and it seems that nothing -- not furious Teamsters nor angry environmentalists, not even Congress -- can stop them. Are the drivers properly licensed and sober or well-rested with the legal amount of down time? Do they speak English or understand U.S. road signs? Will the trucks be carrying illegal immigrants, drugs, terrorists, nuclear or biological weapons or other contraband? Will they belch tons of banned pollutants into America’s air? Will lower-paid Mexican drivers put American truckers out of work? Will the trucks gut the tax...