Unclear how imposter allegedly wrote B.C. exam for David Sidoo's son

Dylan, left, and Jordan Sidoo at home in December 2017.
Somehow, former U.S. college tennis player Mark Riddell was allegedly able to walk into a Vancouver school on June 9, 2012, sit down and write a provincial exam posing as teenager Dylan Sidoo.
But which school allowed Riddell, who was 29 or 30 at the time, to take the exam is a mystery. How an adult was able to slip past exam supervisors and why his presence didn’t raise any alarms is, for now, unknown.
Ultimately, Riddell, now 36, fo