why is the inside of snack packaging always reflective?
Check my answer from when you asked about this before. Just because it is sold, doesn't mean it is safe. I have seen 100% lead weights for fishing at a sporting goods store. There are laws against lead in children's products, and in food and such, but no such laws about adult clothing safety. The warning is there, so you can wear it at your own risk.
If they will UNlock they had to first be Locked so how can you say they won't lock??????