It can not be psychology-related in a big way, because to do neuropsychological tests would take time. If it were something obvious (e.g. psychosis), the public defenders would try to use it for insanity plea and they did not. Likewise, anything else that would be immediately obvious (e.g. seizures).
So it has to do with something that could be detected easily upon admission. Either physical exam or labwork or toxicology screen.
Lab work, btw, may not necessarily imply STD as some people assumed. An indication of an overactive thyroid or something like it might be a debatable issue, for example.
Or even, THC in urine given it is Colorado. Anything that could have dubious interpretation.
DNA was the thing I was thinking about a lot and decided that whatever it was, it could not explain him killing two daughters, so, irrelevant.
Or am I missing something and it was it about prior health records?
Then, anything that could not be used for the defense but some private condition that would cause humiliation if revealed. Or some of SW’s diagnoses. Even in the worst case scenario, it could not explain killing the girls, still.