Just to clarify:

You mentioned that you are 'caretaker for a friend of mine' - does this mean that you are acting in part as a guardian?

If this is the case then the check may be valid for the purpose of ensuring that your friend is being cared for adequately.

That is in no means a critical attack on you by me... I'm just suggesting that the Dr is investigating the background of those entrusted to care for your friend.