Here it is for PA:
Posted: Thu Nov 15, 2007 9:26 pm Post subject:
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http://www.dmv.state.pa.us/pdotforms/vehic...e/chapter13.pdf
(at above link under sub-section 1332)
§ 1332. Display of registration plate.
(a) General rule.--Every registration plate shall, at all times, be securely fastened to the vehicle to
which it is assigned or on which its use is authorized in accordance with regulations promulgated by the
department.
(B) Obscuring plate.--It is unlawful to display on any vehicle a registration plate which:
(1) is so dirty as to prevent the reading of the number or letters thereon at a reasonable
distance;
(2) is obscured in any manner which inhibits the proper operation of an automated red
light enforcement system in place pursuant to section 3116 (relating to automated red light
enforcement systems in first class cities); or
(3) is otherwise illegible at a reasonable distance or is obscured in any manner.
© Penalty for obscured plate.--Any person who violates subsection (B)(2) commits a summary
offense and shall, upon conviction, be sentenced to pay a fine of $100.
(Feb. 9, 2004, P.L.65, No.
and the link for the inspection code in PA:
http://www.dmv.state.pa.us/inspections/pub_45.shtml