For over a year now, I have been bringing a wheeled backpack into the clean room here at work-in it I carry my tools (that are ONLY used in said clean room), my notes about my job, and my medication. This pack has a flap that covers the wheels when I take it into the clean room. When I first started to bring it in here, one of the supervisors in the clean room, went to the plant manager to tell him about the wheels possibly wheeling in contamination, and when I showed the plant manager the flap, he ok'd it. Today I was told that it is NOT clean room approved and that I can not bring it in here anymore. Yet for the last year it has been just fine. I don't know if I am imagining things or if the feeling that I am being picked on, for whatever reason, is valid. I am sitting here at work crying right now, because this has me very upset.