Login to unlock this video.
If you don't already have an account, sign up to enjoy more TVNZ content anytime, anywhere.
Greg Woledge was a young father, killed in a horror road crash, the driver who caused the crash had been smoking cannabis. So why wasn't he charged with drug driving? Sunday investigates.
Join Miriama Kamo and the team as they delve into the subjects that matter to you.
Titles, characters and all other elements are the trade marks and copyright of TVNZ or its licensors. All rights reserved. Further details available here.