http://www.stratfor.com/topics/terrorism-and-security/tracking-mexicos-drug-cartels - If you want to learn more about border security in the US, there are several online information sources you can check out. You can also learn how this helps efforts on border wars and how it prevents any Mexican cartel from fully permeating in the US. You can also read about how border security prevents a drug cartel from getting past the border and into the country.