A young driver is filmed inhaling laughing gas behind the wheel just moments before crashing his car and killing three teenage passengers.
Thomas Johnson, 19, was behind the wheel of a BMW 3 series when the car crashed into roadside furniture and a tree, killing Elliot Pullen, 17, Ethan Goddard, 18 and Daniel Hancock, 18, on the A415 in Marcham on 20 June last year.