As title suggests someone at work is eating my lunch 2-3x a week. Yes I put a name tag on my food, both on the plastic bag and then on the lunchbox. This theft almost always occur 99% of the time I get takeaway such as a sushi box or some kind of takeaway. Other times they'll look in my lunch box and nick parts of my lunch such as my chobani yoghurt or up and go other prepackaged snacks.
The higher-ups won't let me view CCTV and they said they'll investigate and despite reporting it in early December, it's been happening again shortly after the Christmas/New Years break. Friends have suggested putting unbearably hot spices or laxatives or something to mess with them but I have the feeling I'd get in trouble.
update: i will go with a really hot sauce and put it in one of my lunches, thanks for the ideas guys :) Will let you know how it goes
update 2: purchased hot sauce as someone suggested in the comments from the chilli factory, will keep you updated