Back in the day of my foolish youth I got a criminal record. I've since been summoned on two occasions by the crown courts computer system for jury service.
When I reply to the computer generated summons stating that I am free and can do the jury service, they then "check you out" in a more thorough manner.
And of course once they've delved into my past I then get another letter stating that my services won't be required after all, lol, no big deal, i don't give two hoots.
So, in blighty I can't do jury service due to my past misdemeanours. But in America, it seems you can become president, the most powerful person on the planet, even though you have more serious crimes under your belt!!!