"Detective Sergeant Andrew Lonergan .... told the court the Strike Force Rosann "don't know what happened to him that day", despite confirming they had handed a brief of evidence against his foster mother to the Director of Public Prosecutions (DPP).
Detective Sergeant Lonergan confirmed police had asked the DPP to consider laying charges against the foster mother of interfering with a corpse and perverting the course of justice.
The court heard those potential charges were based on "one of the possibilities" that William's foster mother disposed of his body after he died in an accident.
No charges have ever been made in connection to William's disappearance."
The foster father is facing charges of giving false or misleading evidence to the NSW Crime Commission, as the court heard new details of the investigation into William's disappearance.
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