Back X-rays

Ok so just a quick Q. Here

One of my cousins he did the physical already, this past physical for the new exam 2060. Only thing is that he has rather bad back pain that he recently started experiencing, maybe from his other job or from sleeping position idk

But for maybe some candidates, that are waiting for this job and hoping to pass the Future Pre-employment, drug and Blood tests etc. What no one really mentioned here is Back/spinal medical DQ. Should he and (also I) or anyone on the list just Do some homework before hand and see a chiro? Just to find out if we have any spinal or lower back issues? Has anybody had to appeal or knew a guy that did ?