I have travelled extensively, including through many airports in the USA. I travel with a CPAP machine (I don't use onboard, but carry it with me for safety).
RDU is the only airport in the world (including more than 6 in the US) that I have travelled through that requires the main CPAP unit to be taken out of my bag for x-ray.
Every time I ask them why, they say that is TSA procedure and infer that every other airport in the USA is wrong.
Why is TSA in RDU different and require a medical machine to be taken out of one's bag for xray?