CBD be a bit trickier than a sea serpent to predict. While it's less likely to show up on a test, some CBD products might have trace amounts of THC that could raise the Jolly Roger on a drug test.
As for delta 8, it be a close cousin to delta 9 and shares some similarities. Depending on the test and the dose, delta 8 might trigger a positive result, for it be metabolized in a similar manner.
Delta 9, bein' the main ingredient in regular marijuana, be most likely to send the test cannons blazin' with a positive result. It's the one that most tests be aimin' to catch.
Remember, matey, even though the chances be small, there's still a risk of a positive result with CBD or delta 8. If ye be worried 'bout walkin' the plank, best to steer clear of them and keep yer course clean and clear. Arrr!