Half an hour later, he had killed four police officers.Investigators would later track down 25 people who had bought, sold or used drugs with Singh leading up to the crash and took their statements, painstakingly detailing Singh's chronic, almost obsessive drug use He believes many felt sympathy for the investigators."Probably shows the common humanity, I suppose, between us and the public which is probably not the same in other jurisdictions around the world," Price said.Singh was ultimately jailed for 18 years and six months after getting his sentence reduced on appeal.Simiona Tuteru was originally charged with four counts of manslaughter and multiple breaches of Heavy Vehicle National Law, which sets strict limits on how many hours truck drivers can work in a 24-hour period so they are safe on the road.Investigators alleged that was what made Tuteru "grossly negligent".At the centre of the law is a concept called chain of responsibility, designed to keep everyone in the trucking industry accountable, including managers and executives, for the actions of their drivers.On the surface, Connect Logistics was the picture of excellent work health and safety.But when Lineham opened the company's books, he found egregious breaches