[mm34b]

A bit more detail.

Excerpt from the Regulations Manual.

Window tint shall fail safety inspection if:

(a) Any window on the vehicle with after-factory tint has a light
transmittance of less than thirty-two percent (32%).

(b) The tint on any window is red, yellow or amber.

(c) The tint on the windshield extends more than five (5) inches below
the top of the windshield or is below the AS1 line of the windshield,
whichever is longer.

(d) All material used to tint a window(s)shall be non reflective and shall
not be red, yellow or amber. After market tinting above the AS1 line
must comply with G.S. 20-127(a)

http://www.ncdot.org/dmv/vehicle_ser...nforcement.pdf