There is a resentment of law enforcement, there's a resentment of authority, and, as a result, you don't want those people on your jury. And it may appear as if you're being racist or whatnot, but you are just being realistic. If you take well-dressed. It's that simple. Look at their dress, how they act.
Most jurors bring a book to read.
Look at their book. If the guy is reading Karl Marx, you don't want him. Use your common sense. If the guy is reading a spy book or a police book, you're gonna like that person, because he's more philosophically attuned to conservative aspects. You do not want smart people.