What to do about theft?

[kgzak]

We have had multiple things stolen from our robotics room. We had a portable bandsaw, My personal drill, all our drill bits, a laptop, and, just last night, our entire tool box. My question is what can we do to prevent this from happening. We keep all of our stuff in a locked room. We believe that the thief may have the key seeing as there is no other way to get the tool box out of the room. I was thinking something like a security camera. Do you have any other ideas? I want to make sure nothing else can be stolen.