No after-market tinting material shall be installed on factory tinted windows exempt -from window tinting limits under FMVSS 205 (rear side window and rear windows of multi-purpose vehicles such as Suburbans, Blazers, Jimmys, vans etc. and the rear windows of Pick-up trucks under 10,000 lbs. GVWR if the final application of tinting material results in a visible light transmittance of less than 35%.
16- 222 C.M.R. ch. 12, § 3