Originally Posted by mrmum
Personally I do sometimes let the "checkee" log these flights as PIC, if I do nothing other than observe they are still safe and competent
A 'checker' might not even be a licensed pilot, in which case there is no option. For example, in the case of a privately-owned aircraft 'the checker' could simply be the owner (or his/her representative) ensuring that a fully licensed, rated and current 'checkee' is safe and competent to use his/her aircraft. The owner is the final arbiter, and there might be no licensing requirement for the 'the checker' to be an FI or, indeed, a current licensed pilot for that matter, eg. 'the checker' could be without medical.
Regardless, establish who is PIC beforehand.
And, anyway, define 'check out'...