source please.
You could certainly expect to avoid some pain by meditating. Maybe you picked up a coffee cup that is a little too warm, and you just "mind-over-matter" through it. Sure.
But if you got shot? Well, I can't imagine a scientist is going to feel comfortable actually testing anyone claiming they could meditate their way through that.
Um... how does one even perform such a test? It's not like you don't know you're meditating.