Portugal has been the first country to fully decriminalize all drugs usage since 2001; July 1st 2001 to be exact. According to the report, after 5 years of the decriminalization policy have been implemented, study shows that drug use within the country decreased tremendously.
The change in law was perceived as making Portugal a center of so-called drug tourism. But this fears of "drug tourism" have turned out to be completely unfounded.
This policy also creates dichotomized reactions among police officers: older officers are inclined to believe that the decriminalization scheme makes issuing citations a waste of their time, whereas younger officers view the administrative process as the best hope for containing addiction.
Drug policy-makers in the Portuguese government are virtually unanimous in their belief that decriminalization has enabled a far more effective approach to managing Portugal's addiction problems and other drug related affliction.
Drug decriminalization is a great idea, but I don't think Malaysia is ready for it. Not at least at the part where "possessions of drug is allowed for personal use" because it may lead to bigger problems in the long run. Malaysia already have a set of law where drug dependants who willingly chose to undergo treatment and rehabilitation under Section 8 of Drug Dependants (Treatment And Rehabilitation) Act 1983 (Act 283), may apply to a Rehabilitation Officer to be provided with treatment and rehabilitation in respect of his/her drug dependency.