I think testing for cognitive function is going to prove impossibly difficult - or at least for now. How do we set and quantify an acceptable value for cognitive function? How will we execute testing? When do we test? How often? Who will do the testing? How do we counter for potential performance drugs for test candidates? Do we notify the public on the test findings? There’s just a lot involved with making this the barrier to entry vs age or term limits.
Oh absolutely. I’m a walking, talking banana if you catch me at the wrong time or on the wrong day.
Also, if we went this route and tested for cognitive function- I’d 100% guarantee that our politicians would be on Adderall or some other amphetamine…if they weren’t already.