SALEM, Ore. — Banks in Oregon are reluctant to deal with the state’s new legal marijuana businesses because many fear a federal backlash.

Securing something as simple as a checking account can be nearly impossible for cannabis business owners.

There are some exceptions, but while Maps Credit Union, for example, accepts marijuana business, it doesn’t advertise the accounts, and businesses with accounts are asked to sign a nondisclosure agreement.

Other banks are mistrustful of assurances from federal agencies that if they serve cannabis businesses they won’t face money-laundering charges.

According to marijuana business owners, some banks have told them that serving their businesses could lead to the banks’ losing their FDIC insurance. However, a 2014 directive from the Financial Crimes Enforcement Network, a division of the U.S. Treasury, provides some clarity on the issue.