Well, the guy isnt retarded, but he's possibly borderline? I dont know if there is a hard IQ number for retard/non-retard, but hes probably 5-10 points over the threshold if there is.
I have never had to ask my guys for doctors notes. I see it as their business, not mine. This guy, however, has slight "dirtbag" vibes that I cant pin down. I hear the other techs mention that he says things that make me think he is not doing right by the other techs or the customers, but its hearsay and I dont want to act on it. I dont have the time to make this a whole investigation (my fault, I know). It very well could be that his communication skills are so poor that he just comes off that way. Im trying to be level-headed and not let my personal dislike for the guy cloud my judgement.
The low-T thing is something I dont know that much about, so why not let GD determine if this guy is full of shit, right?