IIRC, it must be at least double distilled since it's toxic after just a single distillation. And, yes, Mexico is extremely aggressive when it comes to protecting the Tequila trademark. Next to oil, it's Mexico's most lucrative export. The invention of the Margarita has pumped billions of dollars into the Mexican economy over the years.
It’s may favorite import from Mexico next to oil. I like me some burritos too.