> So Trump isn't so crazy on this whole wall issue .... A wall can't stop fentanyl. A single gram of fentanyl is good enough for somewhere on the order of 10^

> So Trump isn't so crazy on this whole wall issue .... A wall can't stop fentanyl. A single gram of fentanyl is good enough for somewhere on the order of 10^5 doses. It is a trivial matter to smuggle a few grams of substance into a country, wall or no wall. There are even stronger opioids making their appearance, such as carfentanil, which are 100 times stronger than even fentanyl. Only 19 grams of carfentanil a year are enough to satisfy current US medical demand for this substance. Walls or Mexico cannot stop the war on drugs and the lopsided, perverse incentives it sets up, and the thousands of lives it ruins. That is entirely up to the American public and their representatives.