Defense and attack

Hello There,
I'm operator of a nightclub, and lately are a lot of people go to make trouble and usually have something. Mostly it is a knife but with this spray does not care simply spray with suspicion or repeated requests, and call police or emergency itself put out of action the person !!! We live in a time where there you should protect real and I mean really protect, the same goes for private persons! Fox Mean Green has since for each one something and believe it to show me the spray effect!