Sounds like they need to find an alternative to breathalysers if such false positives can occur - if your instruments are unreliable then either get a better one or at least have a second-line test that can produce results real quick. Might also be an idea to assign Sun journalists to outside seats if they're planning on flying in the near future.
I hadn't read the Sun's article until the link was posted here today, down to their usual standards of accuracy and calm, unbiased reporting, I see (which is why I rarely look at it, my choice in comics is higher than that).