Ex-Labor staffer accused of child exploitation, Benjamin Waters, to undergo mental health check By Richard Davies Benjamin Waters was arrested following an investigation by SA Police and the AFP. ( Print text only Cancel A former South Australian Labor staffer charged with producing and possessing child exploitation material will remain in custody until a mental health assessment is carried out. Key points: He has applied for home detention bail, but a report has raised concerns The former staffer to SA Labor MP Nat Cook was expelled from the party last week He has applied for home detention, but a report into the suitability of his accommodation has raised concerns.