You can't train someone to be impartial. There are problems with the juries and the court system but specially selecting juries isn't going to solve it. Jurors are supposd to be impartial and if this case had an expert jury they'd bring with them their own experiences with the patent system both positive and negative. So I'm a developer. Suppose I get called into jury duty and it's a case of some company suing a developer for checking an email account they set up for a client and the prosecution is arguing that the developer was in the wrong for doing so without permission. And let's say the reason for doing this was to verify that some transactional email accounts were working or to click an activation link for some peripheral service. Yeah, it's a way out there weird example but try not to get hung up on the details and stay with me on the bigger picture. As an expert juror I'm inclined to side with the defendant because I know how frustrating it is to work with clueless people and wait forever to get things done and I've created email addresses for people before and gone in there real quick for the exact same reason. Objectively what was done was wrong but in my mind it's justified. So I side with the defendant, persuade the other jurors and get the guy off the hook. The point is that experts are arguably more biased than anyone. A doctor being sued for malpractice with an all doctor jury will have lots of friends on the jury who will probably side with him having most likely feared or dealt with malpractice suits their whole career. That's why I like the idea of lay people getting the facts from expert testimony. You also can't train people to be color blind. If I told you not to notice someone's skin color it would just draw attention to it. Once something has been said or seen it cannot be unheard or unseen. America is a racist country, most jurors are white and middle class, and that's why you see more blacks being convicted than whites.

It's a messy issue with no perfect solution so non-experts are the best solution so far.