Ignorance or mistake.
18 Pa.C.S. § 304
in effectIgnorance 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 to 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.
Source: Open US Law by Vaquill AI (CC BY 4.0)URL: https://www.palegis.us/statutes/consolidated/view-statute?txtType=HTM&ttl=18Fetched: 10/16/2026