When you say that, I remember lead in paint. Kids chewing on lead in paint was an issue, then the lead in toys, and then you get to our sports world or our police, where they're now going back and looking at evidence because they have a new technology to identify things that they didn't used to be able to identify.
How do we get that science? You say “precautionary”, but we don't have the science that says it isn't. If you don't have that technology, how do you justify that in the science world so that you get to that precautionary stage?