HuffPost Denver:  “Marijuana dispensaries in states that have legalized medical pot are struggling to obtain service from banks and credit-card companies, pressured by federal authorities who consider illegal the business estimated at $1.7 billion annually.  Operators and supporters of marijuana dispensaries say banks are turning away their business because they risk falling afoul of anti-money-laundering and drug-trafficking laws.  The largest U.S. bank, Bank of America Corp, said it started withdrawing services from dispensaries after receiving a warning from the U.S. Drug Enforcement Administration in late 2007 or early 2008.”