dont see tinting mentioned in regs
but they do have to comply with 500' rule
how you prove to a cop you are in compliance, i dont know,
i wouldnt risk it
would rather use removeable headlight covers instead
http://webserver.rilin.state.ri.us/Statutes/TITLE31/31-24/INDEX.HTM
§ 31-24-1 Times when lights required. – (a) Every vehicle upon a highway within this state at any time from sunset to sunrise and at any other time when windshield wipers are in use, as a result of rain, sleet, snow, hail or other unfavorable atmospheric condition, or at any other time when there is not sufficient light or visibility, because of severe rain or any other condition, to clearly see persons and vehicles on the highway at a distance of five hundred feet (500') ahead, shall display lighted lamps and illuminating devices as respectively required under this chapter for different classes of vehicles, subject to the exceptions given in this chapter with respect to parked vehicles.