Let me clarify things....
Muslims aren't allowed to drink alcohol. As for trading in it, it's
certainly forbidden to sell it to Muslims, but I'm unclear about
selling it to non-Muslims.
That's not to say that I cannot touch alcohol entirely...
otherwise, I would be sinning every single time a fellow medic
swabs my forearm to do an IV infusion. It can be used as an
antiseptic so long as you wash it off afterwards... in this case,
the need for sterility takes precedence over everything else.
But that said, there are eating places that sell halal food and
alcohol on the side in order to cater to non-Muslims. I believe
that Rice Table is one such eating establishment. However, if they
choose to do so, they are not allowed to apply for the halal
certificate from the Islamic Religious Council of Singapore.
The same goes for Malaysia.... I remember having sushi at a
conveyor belt sushi bar in KL which didn't have the halal cert. The
reason was that they had sake and beer on the menu. However, most
of the waitresses (and the manager) were Muslim.
Hope that helps to clear things up.