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president trump insists his big, beautiful wall will stop the flow of drugs from mexico, but how effective would a wall really be? dr. sanjay gupta has more from the mexican border. sanjay? well, don, it s a totally different war on drugs nowadays. the drugs have changed so fundamentally. you ll see this in just a second. you d be hard pressed to believe, i think, that a wall would make a difference when you look at what is happening nowadays. what is the first thing that sort of flags this? sometimes it s driver s behavior. they re unnaturally nervous crossing the border. sometimes it s the car hasn t crossed the border a lot or sometimes the car has crossed the border too often. what you re witnessing here are efforts in stopping drugs
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okay? everything good? reporter: and plans to dismantle obamacare fell apart, majority leader mitch mcconnell came under swift fire. after hearing repeal and replace for seven years, he failed. so did alaska s lisa murkowski. really let the republicans and our country down. too bad. we ll build the wall. don t even think about it. reporter: south carolina s lindsey graham has been pounded for being sadly weak on immigration. when speaker of the house paul ryan and others opposed a debt ceiling deal, the president made it with democrats. the nation can breathe a sigh of relief. reporter: and when tennessee senator bob corker called the white house an adult daycare center, the president fired back little bob corker was made to sound a fool. and he doesn t apologize for a word of it. we ll see what happens in the end. sometimes it helps. sometimes it gets people to do what they re supposed to be doing. reporter: a great many americans may look at this and see more evidenc
minutes later, field testing reveals, cocaine. this is a win today. reporter: in the midst of the country s opioid epidemic, president trump had made building up the wall a cornerstone of his agenda. the wall s going to get built folks, in case anyone has any questions. the wahl s going to get built and stop drugs. reporter: but i wanted to be effective on just how clear on just how effective the wall would be on accomplishing that. this is literally a physical wall between two countries. the advance of hard narcotics don t come through a place like this. the vast amount of hard narcotics come through the port of entry where we just were. reporter: and besides meth, cocaine, heroine or marijuana,