A large part of having a safe Haunt is how you handle those people coming through it. They must not RUN! Always walk, no matter what. Enforce this every minute.
No drunks--No drinking on your property-No body! Ever!
Have methods or a system already in place to handle any roudys or drunks, don't get caught by surprise, they will be visiting you, eventually.
If you must have children working for you (not really legal in most states) have them only with their parents standing right beside them, looking out for them, seeing what goes on.
If a "Puncher" comes into your place and ends up punching someone, they will try to say "sorry" they scared me" or "Sorry, i am drunk'.
Don't believe them. Every time the apologizing drunk says this it is always ironic to me that given the drunken choice to smack someone in-costume, they Always smack the smallest "Monster", who might be a kid or a woman, they are never so drunk as to pick on someone who might return the abuse with full-force upon them, so how drunk were they really? Poor excuse and a basic lie. Prosecute them.
Have your haunt better lit instead of too dark. People will run into doorways and trip over many things if given the opportunity of it being just a little too dark.
Train your helpers to not advance too close to anyone. Many good scares can be created without getting closer than an arm's length, then be ready to beat a quick retreat.
All customers must take off any masks before coming through. This will keep them from joining in the scaring and possibly your people getting blamed for something they have done.(Or said, or touched)
Criminal back round checks are becoming the "Norm" for Haunt owners and employees. In this state through a company, it costs $16.00 unless they share some parts of their name with a criminal, then the state computer kicks the name out and they might have to go someplace and get finger printed $45.00 here.
We might wait almost a month for one check to come back or it might only take less than a week. When carnival season begins there is a backlog because "Carnies" have to get checked too, along with ski-slope lift chair operators, and there are two ski slopes not far from me here in illinois (Mount) Carroll, Ill.
Now we have to erect a small sign at our door (officially approved small size) of a pistol silhouette with a red bar through it meaning we have the legal right to say "No guns" here. If the sign is the wrong size or heaven forbid," homemade" we are wrong and it sounds as if any gun-carrier could make legal problems for us and they could bring their gun along with them into our house. ("BOO!"-"BANG!" He scared me! Sorry.") No good.
You could have the safest, best built, well designed haunt ever, yet those pesky "people" can really mess it up in so many ways, but don't allow any people into it and ... then where's the FUN?