What is the entrapment by estoppel defense?

Entrapment by estoppel is an affirmative defense that applies when an authorized government official tells a defendant that certain conduct is legal, and the defendant reasonably believes and relies on the official. Brebner, 951 F.2d at 1024. "A defendant's reliance is reasonable if ' "a person sincerely desirous of obeying the law would have accepted the information as true, and would not have been put on notice to make further inquiries." ' " Id., quoting United States v. Tallmadge, 829 F.2d 767, 774 (9th Cir.1987), quoting United States v. Lansing, 424 F.2d 225, 227 (9th Cir.1970).