11 Del. C. § 441: Ignorance or mistake of fact as defense.

In any prosecution for an offense, it is a defense that the accused engaged in the conduct charged to constitute the offense under ignorance or mistake of fact if:

(1) The ignorance or mistake negatives the state of mind for the commission of the offense; or

(2) The statute defining the offense or a statute related thereto expressly provides that the ignorance or mistake constitutes a defense or exemption; or

(3) The ignorance or mistake is of a kind that supports a defense of justification as defined in this Criminal Code.