Thank you for your answer. You are correct, my employer did not disclose my condition to the security guard, they were adamant about it. In fact, my HR department ha strived to maintain my privacy - one of the other reasons they wanted me to work from home is I have been appearing pretty sickly lately, and other employees went to HR asking if I had a contagious disease... so my HR has actually been meeting the ADA standard aggressively.

I really don't want to sue anyway, but I am kind of offended that the security guard didn't talk to me, that's all. I don't know if I can keep my mouth shut once I return to the office towards this security guard.

The only thing that my employer did, which it was within the rights to do I believe, was to try to force me to take FMLA., it was my bosses that told HR that I am able to work from home, which I guess is my accommodation.

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The security guard works for the building management company, not your employer. Under the ADA, the employer is restricted in what it may disclose about your disability to others, so the guard should not have been told about your disability by the employer. If you never told the guard either, than he very likely had no idea you have a medical condition that might make it seem you are intoxicated. There’s nothing illegal in him reporting what he thought he saw to your employer. In any event, what the guard did would not be an ADA violation because the guard doesn’t work for your employer.

Your employer has a responsibility to not discriminate against you because of your disability. You have not indicated that anything negative was done by your employer as result of this. If the employer did not take any action against you over this then there is no ADA violation.