It was about three years ago. I had a fellow remove some asbestos tiles from my basement and he really did not follow the proper procedure for doing such a project. At that time, I knew nothing about how it had to be done correctly and safely. He was there just a day doing the job. He put the tiles in the black plastic bags and took them away for me. I am assuming he disposed of them correctly. Again, I was not aware of how this project should have been done.