Judge Andrew Napolitano tonight weighed in on vaccination remarks made by New Jersey Gov. Chris Christie and Kentucky Sen. Rand Paul.

Christie said that his children have been vaccinated, but that parents “need to have some measure of choice in things as well.” Paul said he has been told that some vaccinations have led to “mental disorders.”

“I think they both were arguing the default position is parental, not governmental,” Napolitano explained, adding that half of the nation’s states allow students to opt out for philosophical reasons.

Still, if parents don’t vaccinate their child, and they knowingly send their child to school when s/he is ill, those parents could be indicted for doing so, Napolitano explained.

Megyn Kelly also remarked that science has failed to prove a link between vaccination and autism.

Watch the discussion above.