Bear in mind that there are a whole s-load of T1’s who drive without a CGM (in fact most do, since CGMs are still relatively rare especially outside the US). Nevermind the CGM - lots of us learned to drive back before there were even BG tests. So arguing that a CGM is medically necessary for a diabetic to be able to drive is not going to hold water since the vast majority of diabetics drive safely without wearing a CGM. The argument has to be that a particular diabetic cannot keep their BG in a safe range while driving without it going low unexpectedly and to dangerous levels.