Comment: Common products

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In reply to comment: I got carded for NyQuil (see in situ)

Common products

can be used to manufacture other things. Like Meth - cold medicine, lithium batteries, and ether(starting fluid or carbcleaner)
Bombs - fertilizer
etc, etc ....
You are carded when you buy these not because of your age, but because the government is "keeping you safe" by tracking the people that purchase these items and looking for repeat purchases from the same person. The government is just like your mommy and you are never too old to listen to your mommy.