Montana attorney Chris Lindsey has an excellent essay in the publication Medical Marijuana Business Daily on the federal prosecution of medical marijuana businesses in medical marijuana states. The entire essay is worth a read and I excerpt the forfeiture-relevant portion:

Any money made, or assets bought with the proceeds, is subject to forfeiture to the U.S. government and is yet another felony offense. Using a bank to deposit sales proceeds is “Money Laundering,” and, you guessed it, another felony. And don’t expect your bank to be on your side: It just might freeze your account and hand your money over to the government even before the raid starts.