U.S. Postal Service to newspapers: your marijuana ads are illegal

While ‘neither snow, nor rain, nor heat, nor gloom of night’ will stop the U.S. Postal Service from delivering the mail, that promise apparently doesn't apply to Oregon newspapers that carry marijuana ads — despite marijuana being legal in the state.

A recent USPS memo issued out of its Portland headquarters warns newspapers: continue to run paid ads for medical marijuana dispensaries and herbal shops that sell cannabis-related products, or face the wrath of the federal government.

And that edict also underscores the growing struggle created by conflicting state and...