People choose THC-free broad-spectrum CBD to avoid intentionally added THC...

https://emilysexpertop-ed.hexaforgey.com/posts/why-do-some-drug-tests-flag-cbd-even-when-it-is-legal

People choose THC-free broad-spectrum CBD to avoid intentionally added THC while keeping other hemp compounds. Trace amounts can still matter for drug tests. Check a batch-specific COA, and ask the testing provider what its screen detects.