This is just a thought on the "wall" which is a lousy idea at best...and I think we have technology far more effective to identify folks crossing illegally.....

BUT...you can tunnel under it, fly over it, with 6000 thousand miles of water on either side of it..you could arrive that way... AND I was in Victoria Canada the weekend after 9/11 and those terrorists had come in over the Canadian border and boy was it a slow and arduous process complete with dogs et al to return to the states by ferry.....

Francis was completely right about building those "bridges"....and walls are a joke...both morally and practically. BUT  they appear to appeal to folks whose anger is high, judgement low...and educational attainment level, most likely minimal.  They feed the "red meat" quotient of red meat voters!