Screw Toy Battery Covers

I pose the question, "Why do toys made in China have screws locking their battery covers?" Yes, I assume it's to "protect" small children and keep them from swallowing batteries (has that been a huge problem?) but where is the law requiring this? I can't find anything on the interwebs. If you know, please leave me a link with sources that can be peer reviewed.

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MUSIC
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TweetTomTom by P. Del Castillo used with permission

PRODUCTION NOTES
Edited on Apple Final Cut Pro X
Shot on Panasonic G85 and Samsung S6

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