Police body camera video has been released of the moment seven police officers stormed a Gold Coast unit to find an unconscious and critically ill teenager slumped on a bed.

They lift him up, try to wake up, one officer laughs as his legs flop to the floor, before the officers leave him unconscious on his bed without calling an ambulance.

Later that day, 19-year-old Charlie Robertson's flatmates reported him dead.

A coronial inquest into Robertson's death this week heard the Bond University student overdosed on a toxic concocion of GHB and cocaine.

The police officers who attended have told the court they thought he was sleeping or drunk. An hour after busting in, the Rapid Action and Patrol officers walked out.

A doctor has told the inquest Robertson had an almost 100 percent chance of surviving if paramedics had been called.

Roberston's parents are now fighting for more training for front-line police officers and for laws that will prevent more deaths like their son's.

"They left our boy to die," Graham Robertson said.

"Rose and I will never walk away. We will see that justice is done and that the laws are changed so it doesn't happen to any other family."