Mexico's government plans to search 10 percent of all vehicles entering the country from the United States

"Mexico's government plans to search 10 percent of all vehicles entering the country from the United States in an effort to curb arms smuggling, the attorney general said." "Most illegal weapons in Mexico come from the United States, according to officials in both countries. Many end up in the hands of powerful drug cartels that supply most of the cocaine entering the United States from South America."
It is illegal to smuggle weapons into Mexico and Mexican Citizens cannot legally possess weapons. There is a connection between weapons smuggling and the drug trade. A lot of the weapons end up with the drug cartels, which are criminal organizations that promote and control drug trafficking operations. It is possible that this availability of smuggled weapons is connected to the recent surge in violent crime. The more weapons there are the more opportunities there are for violence. The Mexican government is attempting to control the problem by searching more vehicles. It is hopeful that this will help keep the violence down by eliminating the amount of harmful weapons which make their way into Mexico.