Lena: workplace drug test after CBD use; safety-critical role

Facts. Lena, a rail maintenance worker, tests positive for THC after using a CBD oil.

What the law says. This is mainly employment law. CBD products can contain controlled cannabinoids, and many are not exempt [unverified — Home Office factsheet]. Testing depends on the contract and company policy; safety-critical sectors may have regulatory limits. "CBD flower" (the buds) is controlled cannabis, whatever the THC content claimed [unverified — Home Office factsheet].

What to do. Ask for confirmation testing, keep the packaging, and get union or ACAS advice.