How many drones are there now, out there flying around looking for people and tunnels? Maybe the BP's track record for finding tunnels will improve with more drones, surveillance cameras, and computer technology. There is sensitive equipment that can detect underground activity, right? Sure, for awhile a new tunnel will go undetected, but at some point it will be found and destroyed.
Let me ask you this, where were you in 2006 and 2013 when the Dems wanted a wall and voted for it in significant numbers? Were you saying the same thing then? Should I post the quotes from Obama, Hillary, and Schumer about how much we need a wall? Why is it a bad idea now? Anybody?