either one do not want one, do not need one. >> reporter: that's because he says they already have one, a natural one, the rio grande which separates the u.s. and mexico. >> this stop sign, there may be no other mandatory stop sign in the world. if you don't stop here, it's about a 300 foot drop to the rio grande. that means it's 300 feet up. >> the sheriffs and others here call this god's wall which lines the river throughout most of the county. that's why the sheriff has always thought the concept of a continuous border wall made no sense. other parts are level. >> in a plat area like this where it's easier to cross the river, different than before? >> right. >> reporter: and you have this money, would you use it for the wall or use it for more people and more technology? >> i wouldn't use it for a wall. technology and people. that money would be better spent on those situations instead of the wall. >> reporter: the sheriff says