Give then the Mexican equivalent of the waterboard. Strap the culprit to a wide bosrd or table. Tilt the body 5° to 10° down at the head end. Open a bottle of warm Coca Cola and poor a little down the suspects nose. They start talking quite promptly. A friend of mine is associated with the Federalesand states this mthod is SOP with then and very effective for gaining information.
I wonder if that is the "Ginger Beer" trick they talk about in "Night Watch"?
Have to admit I pictured it done another way but that would work.