In the stores there are two types for sale, one with a yellow label and the other in a clear bottle with either a crude blue label or no label at all. I can't light fires with the yellow label stuff.

"I have seen The gallon jug behind the bar at places where people stagger out after a couple margaritas."

Interesting observation.

This behavior has been discussed on the board before, its bad on a couple of levels. The violation of trust and personal risk is one. The price of a good blanco (white) tequila is very low (just how much profit do they need to make?), but mainly a sacrilege in the capitol of the world for Tequila. Is nothing sacred?