The tannerite issue may have come up, because some NSP CHP NRA Instructor was placing pounds of the stuff under a Buick, and sending it 200 feet in the air. He was blowing stuff up as part of intermission at gun safety classes. I saw this instructor blow stuff up, in front of a Sargent of the NSP. In fact, after I saw that, I stopped participating in his program, and went out on my own. I used to RSO for him to gain experience.
Here is a video of such foolishness.
I ran onto this idiot below, because I purchased a glock cutaway from him on gunbroker. (not the local instructor, but they must be brothers)
When you take something, designed to do one tiny safe thing, and use it to inflict this kind of damage, it is a natural outcome, that the feds, and the locals are going to get involved.