Kukura, T.V.,(1993) Undercover investigations and the entrapment defense. The FBI Law Enforcement Bulletin Retrieved from http://findarticles.com/p/articles/mi_m2194/is_n4_v62/ai_13859809/.

Entrapment is a difficult case to prove. In the case of Jacobson, the governement had information on a potential subject that they wanted to investigate. They sent him a brochure offering child pornography, an order he never received, and it was deemed entrapment. The governement induced the crime. In another case, a diferent subject voluntarily sought out a fake company with child pornography thus making it not entrapment.