A copy & paste from the Kansas Statute governing the color of stop lamps:
8-1721. Stop lamps and signal lamps; color; visibility. (a) Any vehicle may be equipped and when required under this act shall be equipped with a stop lamp or lamps on the rear of the vehicle which shall display a red or amber light, or any shade of color between red and amber, visible from a distance of not less than three hundred (300) feet to the rear in normal sunlight, and which shall be actuated upon application of the service or foot brake, and which may, but need not, be incorporated with one (1) or more other rear lamps.
And governing the color of tail lamps (note that blue dot lenses show red. The brake light changes them to purple):
8-1706. Tail lamps. (a) Every motor vehicle, trailer, semitrailer and pole trailer, and any other vehicle which is being drawn at the end of a combination of vehicles, shall be equipped with at least two (2) tail lamps mounted on the rear, which, when lighted as required in K.S.A. 8-1703, shall emit a red light plainly visible from a distance of one thousand (1,000) feet to the rear, except that passenger cars manufactured or assembled prior to July 1, 1959, shall have at least one (1) tail lamp.