Someone should probably tell Biden that yes, if a Presidential Candidate was going around with blood shot eyes and powder under his nose, the public would indeed be calling for that Candidate to be drug tested and be justified in doing so. Same with him and cognitive test, if you are pushing 80 and are constantly forgetting things and making verbal gaffs, the public is completely justified in calling for you to take a cognitive test.
Just less than a month ago when asked the same question Biden said he was being "constantly" tested. So which is it, is he being "constantly tested" or has he refused to take a test? He can't even keep his lies straight...