[CamelCaseName]

What!?

Would you say "Oh, it's fine!" to someone religious who doesn't eat beef or pork but consumes trace amounts despite a sign saying Halal/Kosher Patties? (As mentioned in the article)

Consider if instead they were allergic -- would they accept something with trace amounts of their allergen?

Restaurants, fast food or otherwise, have an obligation to handle food in a safe manner.

Misleading customers with false advertising is wrong, and potentially dangerous. (I'm told some vegans develop an intolerance for meat over time)

[Zanni]

Yes, for certain definitions of "trace amounts." If you order a vegan burger from a Burger King, you're going to get trace amounts of beef in your burger--from atmospheric contamination, if nothing else.

Personally, I'm with you that using the same grill is too much contamination, but it's a fine line. The only way to be sure is to have separate restaurants, which is what they do in Israel to keep kosher. They serve meat or cheese, not both, in any given restaurant.