March 1, 2017 Vox
Political scientist Peter Andreas is quoted on whether building a wall at the southern border, as President Trump describes, could deter drug smuggling. "The drugs can come under the wall, they can come over the wall, and they can come around the wall," Andreas said.
Trump promised to end the opioid painkiller and heroin epidemic. A wall won't do that. (Peter Andreas quoted) – Vox