A truck driver was on a cocktail of drugs and alcohol days before a fatal crash
Mohinder Singh has pleaded guilty to culpable driving at a Melbourne court
The 48-year-old was behind the wheel when he hit and killed four police officers
The officers were struck by Singh s semi-trailer while impounding a Porsche
A court heard the driver was drug-f ed and hadn t slept for days before crash
Inside killer truckie Mohinder Singh s eight-day drug bender dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.