Imagine that the seat belt law were expanded tomorrow.  Imagine that it not only required you to wear a seat belt, but each of your seat belts had to be marked with a number and that number registered with a government agency.  Each time a seat belt left your property, you would have to notify that government agency when it left, where it went, and for how long.  You would also have to record every other person who used that seat belt.  All this would be recorded in a master database, so that any time a seat belt failed to save someone in an accident, it could be traced back to everyone who ever used it or owned it, to try to determine what went wrong.

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