Treasury Secretary Steven Mnuchin said Wednesday that the cash-only nature of marijuana businesses poses challenges for the IRS.

"This creates significant problems for the IRS," Mnuchin said at a hearing held by a House Appropriations subcommittee.

Many states have legalized medical or recreational marijuana.

However, banks have been hesitant to serve marijuana businesses even in states that have legalized use of the drug because they want to avoid violating federal anti-money laundering and illicit finance laws. That has led to cash-only marijuana businesses.

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Naomi Jagoda ~ TheHill.com