@Baldimo,
That's what I was remembering. Not all their police are on the up and up, though that is probably true, at least somewhat, the world over. Not that I'm all knowledgeable about this, and I suppose it is a complex matter by now in Mexico. I was wondering, though, if they are tracking police killings of suspects.
I suppose I should add that I'm not, per se, anti police. For instance, I've recommended the non fichtion book by Edward Conlan, Blue Blood, over and over on a2k; I found it very worth reading. Of course, I'm not fond of corruption, a matter that infests the world in different places and different ways, by many different people.