Essentially, I would want to read his assessments. Preferably I'd do my own. At the very least an IQ test, and MMPI, and a SIB-r. That would help determine if he has cognitive deficiencies and, if so, in what specific areas, and would help to ascertain his functioning level and if any cognitive issues rose to a level of impacting his ability to participate in activities of daily living. The Calahann site always gives me an error; I'd thought it was removed. I'd love to read more primary sources on this case, though, as I have not had that opportunity.
ETA: an MMPI can expose tendencies toward malingering, and that would likely be helpful information
Does this help? He had a "HIGH" F Value, which points to malingering. From the transcripts:
DAVIS: Now the MMPI-2, that was another test that you conducted on him, is that correct?
WILKINS: Yes.
DAVIS: Now I dont want to get too complicated cause I dont understand all this stuff, but I notice down here you said, lets see, you said he had a highor you said a mild elevation in the F scale.
WILKINS: Yes.
DAVIS: Ok. Now Doctor its true that what you actually found was a T value in that F scale of 83.
WILKINS: Yes.
DAVIS: Now are you telling me that thats a mild elevation?
WILKINS: Its an elevation above normal levels.
DAVIS: Well dont they rank the elevationsas far as the T scale is concerned isnt that something thats actually ranked in terms of low range, middle range, moderately high range and very high range?
WILKINS: Yes. That may have been a mistake then. I may well have mispronounced what it was supposed to be.
DAVIS: This is a text regardingMMPI Handbook. Show me here what an 82 to 88 T score on the F scale indicates to you in that book.
WILKINS: Uh, very high.
DAVIS: Very high?
WILKINS: Yes. This would not be quite the same because this is for the MMPI rather than the MMPI-2, which changed critera, but it would still be in the high range.
DAVIS: So when you put in here that that was a mild elevation, that would not be accurate would it?
WILKINS: No. It would not be. No.
DAVIS: And then from that statement that it was a mild elevation you interpreted that that could show malingering, right?
WILKINS: Yes.
DAVIS: And malingering means what, Doctor?
WILKINS: It means, uh, making up stuff. Trying to present yourself as being ill when youre not for some particular gain.
[snip]
DAVIS: Ok. Well, in your report you said that because of that elevation in that T scalethat 83 score, because of that mild elevation that gave you some concern about malingering?
WILKINS: Yes.
DAVIS: But you characterized it as a mild elevation.
WILKINS: Yes.
DAVIS: When you characterize it as a significant or very high elevation, it gives you more concern for malingering, doesnt it?
WILKINS: Uh, the T value I used the raw scale value, so no. An 83 gives pause for both malingering and for how valid the scale is for a variety of reasons.
DAVIS: Well you indicated in your report that a mild elevation would give pause, correct?
WILKINS: Any elevation gives pause.
DAVIS: Well a very high elevation would give you, for lack of a better word, a whole lot of pause, Ok?
WILKINS: Yes.
Q. Did you indicate that the responses on the L and K were normal?
A. Yes.
Q. Okay, and then you got the highvery high range on the F scale?
A. Yes.
Q. How did you draw the conclusion from normal scores on the L and K range? You said the validity profiles indicate normal responses.
A. On the L and K.
Q. Right. And then the F has this high range thats either indicative of malingering or not understanding the questions?
A. Yes.
Q. And then you go on to draw nearlywell
A. And all I said again is thatis thatis thatusuhthat we need tothat we need to consider this very carefully because of the high F scale.
Q. And if in fact malingering was what we have on this test, then the validity of the other scores would not be relevant, correct? It would not be ayou would not depend on them?
A. Right. Right.