[fwip]

Jurors do not self-select into jury duty, though some try harder than others to get out of it. So the effect is less.

Voters are partial to the candidates they vote for; that's why they vote for them.

[mensetmanusman]

I was able to get out of jury duty by saying I tended to agree with police. This was advice given to me by a friend in law enforcement.:.

[fwip]

Yes, it's not difficult to get out of. You could also get out by saying that you don't trust the police, or any number of things that might affect your ability to be impartial in the case before you.