Jurors are pre-screened.
I can only speak to the province of Ontario, but the potential citizen pool is issued a questionnaire in advance, which all are expected to fill out and return. There is a series of questions about reasons you might be excluded or exempted from the trial. One of them is that you have an existing health condition or mental illness. For all intents and purposes, now I would be exempt from future jury service because I have post-traumatic stress disorder. I'm not saying that I would want to exclude myself from jury duty but I would have to disclose that.
My opinion is that with more screening of potential jurors, we might potentially also screen out people who would be appropriate jurors. I wouldn't want to put limits on the ability to have a fair trial by putting in more and more confounders to limit citizens from that potential.
Before this trial, and still today, I was and am a fairly able-bodied person. You bring into the courtroom all of the collected experiences that an individual has in their life. I didn't think that a trial of this kind would impact me, but it did. I would never have said prior to being in the courtroom that I would be impacted by it, but I was.