The U.S. Postal Service said stamps may not contain any images of cannabis, according to their final ruling they are expected to release sometime this week, yet images of alcohol, tobacco and guns are allowed.

The Postal Service’s filing states the stamps may not contain images of products which are inappropriate for all ages – which happens to include cannabis and all other controlled substances.

Previously the Postal Service sought to ban all of the above imagery from stamps, until public comments resulted in them allowing for “incidental depictions” of alcohol, tobacco and weaponry.

Here’s there reasoning:

“For alcohol, tobacco, gambling, and weapons, the Postal Service agrees that allowing incidental depictions of these prohibited categories of content contained within otherwise eligible images would be consistent with program purposes while maintaining or increasing revenues. For example, an image of toasting wedding celebrants may remain eligible despite depictions of alcohol, an image of an armed services member may remain eligible despite depictions of weaponry, and so on.”

These new rules are scheduled to take effect May 15, 2018.

Back in 2015, the Postal Service attempted to ban carriers from delivering mail and newspapers containing cannabis advertisements. Congressman representing states with legal cannabis legislation quickly pushed back with their own bills to prevent the Postal Service from doing so.