This Mexican Police Training Video demonstrates graphically how they extract information from those that they arrest. The first portion is sort of strange, showing a guy who threw up on himself, but then it moves toward their operational procedures. Like it, don't like it. Watch it, don't watch it. It can be disturbing, however it's part of every-day police and military operations in Mexico. No scars, marks or bruising results from using a bottle of soda water and a dirty rag.
For those of us who work in Mexico, this is something that you see, and it's something that is done. It might be disturbing to those who are safe at home in a peaceful country that is not at war.
It's just another day in Tijuana.