Check out https://www.nhtsa.gov/sites/nhtsa.dot.gov/files/documents/chmsl_complete.pdf
This spells it out pretty clearly, Center High Mounted Stop Lamps (CHMSL) have been standard equipment on all new passenger cars sold in the United States since model year 1986 and all new light trucks since model year 1994, as required by Federal Motor Vehicle Safety Standard 108.
You're misinterpreting it. It's required that manufacturers produce their vehicles with a CHMSL. It does not say the CHMSL cannot be removed from the vehicle.
I don't think all the car makers would have installed them at the same time if it wasn't a federal requirement.
Again, you're misinterpreting. It's a federal requirement for manufacturers to produce vehicles with a CHMSL. It does not govern the CHMSL beyond the sale of the vehicle.
I haven't had my CHMSL light on my TJ for quite a few years. I live in an area where annual vehicle inspections are required to renew your license plates. Not once have I failed an inspection.
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