CBD is 100% legal, as it’s non-psychoactive. You should be fine - they don’t usually test for it.
I think you are correct, it is legal. However, although they don’t test for CBD, I think there is worry it may still show up on a test for THC (the tests are actually for THC byproducts). I know Delta-8 is legal in many states, but it shows up on a cabbabis drug test just as Delta-9 does.