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Why did you put rocket fuel in our food? Why?
Perchlorate is used to control static electricity in food packaging. Sprayed onto containers it stops statically charged food from clinging to plastic or paper/cardboard surface. It's also used in fertilizers.
That's why.
It's also naturally-occurring. It's basically everywhere. They even found it on soil samples from Mars.
It's also not a single chemical. It's a class of chemicals. Potassium Perchlorate is used as a thyroid medication.
It's an anion. There are many different cations that could be paired with it.