One of the proposals floating around Mexico that has the support of a great deal of commentators is a centrally controlled national police, which would replace the state police departments and perhaps the municipals departments as well. (More on that here, here, and here.) This is not a huge surprise, but the nation's governors are all opposed to ceding control of the state police forces, which complicates the unification push.
The above article makes reference to an October study from the SSP that found that 60 percent of Mexico's cops make 4,000 pesos (around $300) or less per month. Also, seventy percent of the same group has less than 10 years of formal schooling.