Suspected individual Shimizu was revealed to have admitted to engaging in cannabis use during his time studying abroad. The revelation has prompted fresh debates over the control and understanding of drug usage among exchange students. As Japan is known for its strict drug laws, the public has called for robust measures to prevent such behavior amongst students going abroad for studies and returning.

Drug usage, particularly cannabis, is heavily stigmatized and legally penalized in Japan. Though Shimizu's alleged usage occurred while he was studying abroad, if he's a Japanese national, he could face prosecution upon his return. This situation has fueled Japan's ongoing discourse about the differing societal attitudes towards drug use domestically and internationally.

Countries in the US and EU have relatively relaxed perspectives on cannabis usage compared to Japan. In some places, its usage has been decriminalized or even legalized, a stark contrast to Japan's strict outlook and policies.