According to media reports, Sato was stopped for routine questioning at Dogenzaka in Tokyo in the early hours of 30 November where he was found to be in possession of a glass pipe. Sato was then brought to the Shibuya Police Station for an urine test and tested positive for drug consumption. He was said to have admitted to the police that he had consumed drugs on his own will.
Following reports of his father's arrest, FujiTV confirmed that the next broadcast of Asano's current drama "Keiji Yugami" will go on as planned on 7 December.
Sources: Yomiuri Hochi / My Navi News / Houdoukyoku