By Jennifer Bernal
Best Defense Drugs & Crime Correspondent
Cops are the first line of defense against gangs, and they have a pretty good understanding of the issue. Talking with them yields a pretty grim assessment: There is a huge gang problem in the United States. Our cops in attendance estimated that the U.S. might have up to 1 million gang members, although the problem is often underreported both because it is difficult to detect and because of local politicians' incentives to downplay crime figures in their areas. The gang problem is inherently tied in to broader regional criminal trends. The extensiveness of drug trafficking south of the border and the degree to which cartels violently contest state authority is well acknowledged. There is nonetheless a common misperception that drug networks disintegrate when you cross the border into the U.S. They don't. Gangs -- mostly youth gangs -- step in to domestically distribute the drugs that cartels traffic in.