I volunteer at our small local hospital. Used to be, the pharmacy window in the hospital was open from 10:00 a.m.-4:00 p.m. A few months ago, they started locking it during the day - you have to ring a bell, and wait for a pharmacy attendant. There isn't even a clear window, so you can't see in. This is a small town on the Oregon Coast - not many minorities, but a lot of white, meth-head trash.
That is what places of business are going to have to resort to. In some high-crime places the convenience type stores use pass-through windows. The customer has to ask for what they want and the attendant gets it and passes it through the recessed drop area. The glass is bullet proof. I think all convenience stores should go to this system. If things don’t get better, all stores will have to adopt some form of this method.