Come into force does not necessarily result in enforcement, as you have discovered. Unlike you, there are foreigners here who appreciate this type of situation very much indeed! I even know of foreign teachers here who teach after drinking 4 big bottles of cheap Chinese beer. Some of their Chinese colleagues even teach after getting sloshed on Chinese liquor. That's China for you.

Four bottles of beer, cheap or otherwise is just warming up for some of these old-timer FT's, and they are not even tiddly. As long as you don't slur your words too much and grope students' bums you're okay to teach.