What rights are being violated here exactly? In the work environment you're most likely going to have to work with people you don't like. The OP said the co-worker is "psycho", that could mean a variety of things. If it's a case of harassment, OP should deal with it accordingly.

I really doubt it's just that OP doesn't like him. There's a very clear difference between annoying and "psycho".

People use the word "psycho" liberally. The guys' probably not clinically so. However, if he's affecting your work performance your boss should definitely be informed.

Him saying "psycho" means it's probably beyond just creepy/annoying, not that he's actually clinically psychotic.

I'm not saying it wouldn't help protect OP, but that's not a solution. The problem is there's someone with mental problems posing a danger to other people, not everyone can have guns nor should they. People need better access to mental health care.

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Very insightful 24.

I doubt he's truly mentally ill. The term 'psycho' doesn't have clinical connotations to most people in most conversations.

21, I'm pretty sure that 17 was just joking and I highly doubt that the coworker is clinically psycho. I think it would be difficult for no one else at work to notice if the coworker was actually psychotic. Chances are he's just really socially awkward, clingy, angry, snaps over really little things, doesn't do most of the work or blames OP for things, things like that.

I was joking. I doubt the situation is so bad that the OP is in such danger that they need to carry a weapon for self defense, and get official documentation saying that the person can't be near them.

Yeah. ************ follows you, pull out a gun. Attract attention to passerbyers as well.