I would assume based on the year of the vehicle, the back lamp cover is faded, making it look bright. It still works though and would get the attention of the car behind them as he brakes, so it works as intended, just not the right color. JMO
Yeah well I have seen people use red tape but to say any color will do is a stretch. There are laws on the books and I don't thing white is acceptable for a brake light. The light was not working properly and gave reason for the stop.
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It shall be unlawful for any person to drive or move or for the owner to cause or knowingly permit to be driven or moved on any highway any vehicle or combination of vehicles which is in such an unsafe condition as to endanger any person or property or which does not contain those parts or is not at all times equipped with lights, brakes, steering and other equipment in proper condition . . . .
Pursuant to § 56-5-4730, "[w]hen a vehicle is equipped with a stop lamp or other signal lamps, such lamp or lamps shall at all times be maintained in good working condition." S.C. Code Ann. § 56-5-4730 (1991).
http://www.judicial.state.sc.us/opinions/displayOpinion.cfm?caseNo=3124