a cannabinoids immunoassay will tend to react with most of the cannabinoid-esque compounds. so, it's not a question of whether or not the test will "show" CBD,

a cannabinoids immunoassay will tend to react with most of the cannabinoid-esque compounds. so, it's not a question of whether or not the test will "show" CBD, but rather, how much CBD is necessary to get the test to think there was an interesting/actionable amount of THC in the sample. it works as a sort of linearish equation, where you add up all the compounds at different ratios, like 1.0THC + 0.5COOH + 0.05CBD + 0.05CBN + ... and if that adds up to "enough" then the test will trigger the testing lab to consider the screen positive. at that point hopefully it goes over to confirmatory testing, where the LC/MS/MS separates all the various compounds apart, and lets the lab know that you had CBD in your system, but not THC.