NORML throws down on the Fed's

The NORML attorneys allege the federal government has engaged in entrapment of California marijuana patients and their caregivers. They point to the courts’ dismissal of County of Santa Cruz, WAMM et al. v. Eric Holder et al.where the Department of Justice (DOJ) “promised a federal judge that it had changed its policy toward the enforcement of its federal drug laws relative to California medical cannabis patients.” So after 2009, California providers had reason to believe that the federal government had changed its policy. The legal argument is called ‘judicial estoppel’, which basically means that courts can’t hold true to a fact in one case and then disregard it in another.

Kumin, Michael, and Silber also argue the government has engaged in ‘equitable estoppel’, which most people commonly think of as ‘entrapment’. That is to say, you can’t bust a person for committing a crime when the authorities told him it wasn’t a crime to do it!

(Source)