fresh tool marks that shouldn t be there. a school that s been recently turned, that there wouldn t be a reason for it being recently turned, they can pick up on that. human art and intelligence together. absolutely. what they find, about 24 key low kilos of hard drugs. minutes later, field test rg in reveals cocaine. situations like this were a central tenant of president trump s president trump s argument this week for a wall. our southern border is a pipeline for vast quantities of illegaldrugs, including method, heroin, cocaine, and fentanyl. every week, 300 of our citizens are killed by heroin alone. 90% of when floods across from our southern border. reporter: but i wanted to learn just how effective the wall would be. this literally is a physical wall in between two countries that we re looking at here.