The criminal justice system is full of concerns and issues that always create challenges for those in charge of this matter. In the meantime, the issue of drugs and the problems it faces has always been one of the concerns of society. This concern can be calmed when a solution is presented for it.

In this study, the legal systems of Iran and Canada, with an emphasis on cannabis, seek to find a solution to reduce this concern. Canadian law has taken a path in which it is in the post-criminological stage with the decriminalization of this type of drug. The Iranian legal system is also challenging the reasons for the growth of this type of addiction in society and is seeking legal and criminological solutions. The importance and necessity of the adverse effects of the drug problem require its examination in various dimensions, and the Canadian legal system can be a good example not for mere imitation but for learning from their experiences. Decriminalization or continued criminalization is a very important issue that is one of the main challenges in the text of the article.