I can’t get a good answer for this as Google is thinking I’m talking just solely on the driver. I’m including passengers who don’t. I’ve seen PSAs that tell you the dangers you pose for others as well when you don’t wear a seatbelt. So if you don’t wear a seatbelt and that results in someone being killed could you not wearing a seatbelt mean you get a manslaughter charge?
In the US at least, it’s not a requirement to wear a seatbelt in the back seat most places.
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These laws differ widely from state to state and there are different requirements for minors and adults.