http://www.stratfor.com/topics/terrorism-and-security/tracking-mexicos-drug-cartels - Each day, a different drug cartel tries to sneak drugs past the U.S. border. The Mexican cartel does not only bring drugs into the country but they are also responsible for a lot of the violence in Mexico. This is why border security is getting tighter. The cartels are very determined, resulting in the border wars. If you want to stay updated on drug cartel activities, search online news sites.