Some people mess up and move your card intentionally or accidentally. How can you prevent that?

There isn't a feature where you can control certain cards. We had this same problem a while back and the best solution we have found is: 1.) Click "watch" on the specific card and/or column. You get notified every time something is done to the card, including moving it. 2.) You can enable the "details" which logs everything in the card and shows you who moved the card to where and so on. Hope this helps!