| Andrea's right. If you're having a hypo, you're basically under the influence of drugs, which is not a good idea when you're inside a 10 ton piece of metal going at 70mph.
I believe the laws in Ontario are similar to those in the UK with reference to reporting incidents. Furthermore, the DVLA (Drivers and Vehicle Licence Agency) also insists that all people with diabetes renew their licence every four years. However, it's free, and you don't have to retake your test. It works more as a reminder to both you and them that you're on the system and that theoretically you can pose a risk. | 
