There are many unions in that allow CBD usage, some have gone as far as removing THC from their drug testing policy. Others have permitted it at a state level. Some variation always exists, but a few have specifically prohibited

Whether they want to add CBD usage into their individual contracts is decided at a local level. On a federal level, hemp and its extracts (including CBD) is legal. Unless your contract specifically prohibits CBD or hemp use, you're allowed

The local unions have to decide whether they want to add CBD usage into their contracts. On a federal level, hemp and its extracts (including CBD) is legal. Unless your contract specifically prohibits CBD or hemp use, you're allowed to