On 31 March 2025 it was disclosed that the Tokyo Metropolitan Police Department had arrested and indicted two people, a 44-year-old man identified as Tsuyoshi Takahashi and an unnamed woman, for the alleged use of marijuana within Tokyo.[1] These are the first arrests by the department specifically for the crime of using marijuana since the revised Cannabis Control Law came into effect on 12 December 2024.[1][2]

During the interaction with police, dried marijuana was found in the vehicle occupied by Takahashi and the woman.[1] Urine tests on both returned positive results for cannabis metabolites, indicating recent consumption.[1] Both reportedly admitted the charges against them.[1]

Before the December 2024 revision, Japanese law punished possession, cultivation, sale and import of cannabis but not use itself; use is now a criminal offence.[1][2]