Ignorance or mistake as to a matter of fact, for which there is reasonable explanation or excuse, is a defense if:
(1) the ignorance or mistake negatives the intent, knowledge, belief, recklessness, or negligence required a establish a material element of the offense; or
(2) the law provides that the state of mind established by such ignorance or mistake constitutes a defense.
1972, Dec. 6, P.L. 1482, No. 334, § 1, effective 6/6/1973.