I was out yesterday because my husband is having surgery. I left worksheets and instructions on top of my desk. I got a call from my co teacher that he was having issues with the sub they sent. When she came in she proceeded to try to get into my locked file cabinet because she wanted a projector to show the kids a lesson she prepared. She said she had a science background. He told her no and just to follow the lesson plans. He got called to the afternoon CST and had to leave the room. She went on and did an unauthorized chemistry experiment with them! The remains of the experiment were left in my sink for me to find this morning! She didn't use any safety equipment because "it's not toxic" is what she said. I had to report it because I'm going to be out for a few more days and don't want her in my classroom anymore. I reported it to the person in charge of assigning subs and she sent it to the assistant super. We both got called in and this woman was in tears. Part of me feels badly because I believe her intentions were good but the other part says she overstepped and did something potentially dangerous. Did I do the right thing?