 This season also saw Ashley van Ham, Emily Wang and Amy-Lee "Amy" Wisniewski making history as they consisted of the only all-female finale in the series' history.Three experts return from "Canada's Worst Driver 3," though Scott Marshall, head instructor for the first three seasons, is not among them.Before the episode draws to a close and the contestants have their first meeting with the experts, Cam takes Donna, Teagan, Ken and Ashley for a tour of the prison and explains to them that their actions that had led them to their nomination and arrival at rehab could have caused them to be sentenced to prison time-- Donna for drinking and driving, Teagan for hit and runs and Ken and Ashley for their street racing on their way to rehab-- after which all four are locked in separate cells for a few minutes, long enough to break down and understand where their consequences will lead them if they're not careful.