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I don't think it is very well regulated. Pretty much anybody can start selling and close shop if the regulators come. For cheap liquor it is very uncommon to have problems because there is not much profit and the punishment is equal to faking expensive liquors. So it more optimal to fake the expensive liquors.

Safety rating for restaurants, pubs etc is much better. There is a 3-level safety rating here. If you just go to the top ones you'll be ok.

So far no methanol poisoning :P

Thankies for the tip :o)