What To Do When Co-Workers Steal From Your Desk

Not too long ago I move my office, I used to have my own but now I share with another co-worker. I don't have a problem with sharing it's nice to have someone to chat with. I'm one of those people who don't collect to much clutter to moving wasn't a big deal. Now that I have been in the office for a couple of months I've noticed a few things moved on my desk, no big deal, phone out of place, pen missing a few little things like that.

Recently I noticed some things missing from my desk, now not from the top of my desk but stuff I keep in my drawers. I don't know about you but now we are stepping over the line a bit, I figure if it's on top of my desk it's fair game to borrow something but if it's in the drawers it should be off limits!

Now I should mention that what I have in my drawers are the usual things, extra supplies, headphones, cleaning supplies and some gum. That's where we have a problem, the gum, gum is great to freshen your breath after a cup or two of coffee, that's why I keep it in the drawer. The other day I went to grab a piece and noticed that the container was a lot lighter than the day before and I saw my co-worker chewing some gum, coincidence? I don't think so, I did a little snooping and found out it was my office mate helping himself to the gum.

I don't have a problem sharing but don't you think it crosses the line going into someone elses drawer to help themselve to your private stash? I know this happens a lot with community refrigerators where co-workers help themselves to other peoples lunch. What do you think I should say to my office mate about this issue?