How would you handle a "food thief situation" at work?

In other words, your place of employment has a common refrigerator where everyone keeps their lunches. Yours gets stolen or tampered with on a regular basis. How would you deal with it?

Also, have you experienced this and if so, how DID you handle it?

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REMsleep · 41-45, F

I worked in a lab and I heard a story from one of my coworkers that at his old hospital one grumpy lady got very sick and tired of people stealing food so she wrongly left cookies out and she worked in micro and she sprinked some bacteria on the cookies.
Several people became very ill. She was charged.