The Council on Foreign Relations has a short (8 minutes) video on Mexico and drugs.
It is a solid overview of the situation and the challenges the country faces, along with a discussion of some of the more positive developments over the past twenty years (e.g. democratization). One thing I found missing, though, is the question of why Mexico is facing this situation at all. The video is titled "Mexico's Drug War" and although the second half of the video brings up U.S. policy options, it does not mention how in many ways this is the U.S. drug war brought to Mexico.