Dr Paul White continued his testimony at the trail of Dr Conrad Murray, and told the court that he believed that Michael Jackson took the anaesthetic Propofol by rapidly injecting it.
Dr White thought it was possible that Jackson had got out of bed, even though he was attached to a saline IV and a urine collection device, found a syringe with 25mg of Propofol in it, got back in to bed, and administered it to himself.
Dr Shafer, his friend and colleague, dismissed the theory as a "crazy scenario", noting that Jackson would have to have injected himself several times to achieve such high levels of propofol in his body.
Dr White, for his part, said that he would not have accepted a job that involved administering Propofol in a non medical setting.
Dr Murray is considering whether he will take the stand himself.
The trial continues.