Do you mean a chiropractor working 2-3 rooms at once, or 2-3 patients in 1 room? if the former, then I'm not a fan, but have no ethical objections, just personal (just seems a bit "join the queue, same for everyone"). If the latter, then I have significant issues ethically, specifically related to patient confidentiality.
Sometimes a different chiropractor doing the same basic thing can have a different outcome, down to skill / power / specific technique used etc etc. You also can't make a diagnosis/treatment plan based on someone else's findings. I'll listen to what the patient has told me about the previous, and I'll take that into account; but it would be remiss of me to discount something based on 2nd hand information - though I may bring in the other options sooner.
I guess I'd use the information the same way as I would any other information - as an indicator, not a hard, and fast certainty
yep ok with that about the different standard of adjustments between chiro's. However if a patient comes along to you having been to a previous chiro whos treatment has made them no better or even worse should this not be taken into account? ie what could look like an obvious problem with an obvious solution might not be such an obvious case? could having 8 manipulations with one chiro and then another 8 with another chiro (and so) lead to possible over treatment?
Yup, and I would have taken it into account. I'd also say that if they were worse after standard STM, then I wouldn't use that as a first choice modality for that patient; I also wouldn't have given them 8 failing treatments if they had that history (I'd only go as far as 8 without improvements in very chronic, stubborn conditions anyway).
So yes, it would affect my judgement, but I wouldn't discount that the patient could just have had a chiro who didn't suit them before either; so I'd still usually try my first choice treatment (assuming that that would be SMT); but I'd probably be keeping a closer eye on any changes, and, as I think I said, would include other options earlier.