Ok so I was asked the question today "are CFI's required for aircraft checkouts"? I'm personally a CFI and I know for the purpose of where I instruct the checkout has to be from a CFI. If that renter wants to fly the schools plane. However, lets say someone (who is not a CFI) owns their own plane and is willing to let a friend fly that plane. Even though he is not a CFI can he provide the checkout?

Is it applicable to single and multi category?

I can't find anything in the FAR/AIM on this.

Thanks again for the help.