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It won't, and in the meantime you've got a business and staff to protect. Chances are they knew about this problem before you did - now they're watching to see how you deal with it.

You need support from your colleagues and medical professionals. What was unknown a few years ago (ice, crystal etc) is now widespread, and some people argue the violence of alcohol abuse is worse than being 'out of it' on illegal party drugs. There are many opinions, plus legal and leadership issues - is your staff manual up to date? Your management team would benefit enormously by meeting with a local drug & alcohol counsellor to find out how they work.