Commissario
It surprises me how many people think OP done the right thing, their's more to life than was is officially right and wrong. This should be called the polically correct thread where anthing not absolutely PC is spat at.
Yes, there is also doing the sensible thing when you're operating heavy machinery of any kind, or someone you know is going to.
Perhaps some of us have some kind of appreciation of the sort of hazards that are involved even in driving a normal car, let alone things like forklifts, JCB's, or other heavy machinery in an often cramped environment with other people.
To put it bluntly if I was in a situation where someone who was meant to be operating heavy machinery came in drunk, I wouldn't hesitate to inform whoever was in charge of the site - I don't want someone putting MY life at risk because he hasn't got the brain cells required to understand that you don't drunk before going into work (let alone work where it is a hazard).
Now, if you feel happy to work with someone who has his judgement impaired through drink and operating even just a Forklift, feel free, whilst the adults who have a rough idea of the risks that are involved in even just power tools carry on with our lives, with a higher chance of making through to our old age with the same number of extremities that we entered the world with.
It's not PC, it's called being responsible, acting like an adult, and ensuring that your work environment is as safe as possible for what it is.
The guy put the op in a hard place, potentially with little time to think.
The Op took a course of action that protected himself and everyone other than the one who was stupid enough to think "I'll get half plastered before work".