Originally Posted by
letsfly75
I don’t understand what a medical has to do with a sim check?
When you think about it, it does make some sense. The checker is acting as an extension of the regulatory authority to make sure a pilot can perform certain maneuvers according to regulatory standards. While he or she isn't charged with the lives of 300 or 400 people in the back, he or she is still charged with re-validating the license which allows the checkee to carry those people.
As a regulatory authority, would you want one of your examiners checking people (and certifying them) who had an untreated psychosis (all jokes aside), had an untreated substance abuse disorder, or even maybe a stroke which had left mental faculties impaired ? In that it might be difficult (but certainly possible--and potentially worthwhile) to come up with a different set of medical standards for certification of designated examiners, the existing ones for pilots are simply used.