 The Mexican government has asserted that their primary focus is on dismantling the powerful drug cartels, rather than on preventing drug trafficking and demand, which is left to U.S. functionaries.Although Mexican drug trafficking organizations have existed for several decades, their influence increased after the demise of the Colombian Cali and Medellín cartels in the 1990s.Mexican drug cartels now dominate the wholesale illicit drug market and in 2007 controlled 90% of the cocaine entering the United States.