How do you know it? Do you know parents who did it, or people who have accepted such letters?

My parents were very anti-vaccination and are part of a 'religion' that exempts us from it... all we needed was a note from a 'religious leader' and its done... I'm not vaccinated for anything. The religion is 'The Universal Congregation of Wisdom' (its very chiropractic, my dads a chiropractor... the 'religious doctrine' is pretty entertaining...)

you can join with a letter and like a 200$ donation or soemthing