The report aims to identify legal frameworks, models, and implementation practices of the decriminalization policies and to assess their empirical results. Statistics show that the prevalence of drug use has increased for decades all around the world despite all the strict measures taken. Decriminalization policy has emerged as a response to unbalanced prohibitionist drug policy, which creates not only social injustices at the individual level but also public health problems and high social costs at the macro level. On the other hand, decriminalization is a complex framework and is generally used as an umbrella term representing contemporary strategy. Governments have tailored this framework according to their priorities and expectations. The report categorizes models, implementations, and outcomes to evaluate results. Besides, by providing overall results from three European countries (Portugal, Czech Republic and Denmark), we aim to assess the impact of the contextual factors and variation of the results. We hope the report will contribute to the discussion of developing better policy models managing drug problems.