Formula for checking validity of Canadian driver's licence number?

Considering that most Canadian drivers license are conterfiet and usually issued to N Korean drivers the Mod-10 type check that would be used to verify an existing CC number is not a valid point because, N Koreans are terrible at math. The Bug Blatter beast of Trall would have had a definitive way to solve the Canadian licensing issues if it were not wiped out by the unfortunate flood of the Pan Galactic Gargle Blaster after Zaphod Beeblebrox ignited the facility whose sole purpose was the manufacture of said drink. But, really if you are looking to go to Canada for a drink and you do not have the proper calendar dates to back you up then fly to Thailand where it won't matter, just take a towel...