The law was subsequently vetoed by Vaclav Havel, then president of the Czech Republic. Then, the parliament overturned the president's veto and the amended law went into effect on January 1, 1999. Following these turbulent events, the National Drug Commission proposed that the government evaluate the impact of the new amendments by means of funding a scientific study.
The researchers were asked to address five hypotheses that the Czech government wanted to have tested. The hypotheses were: "After the introduction of the penalty for possession of illegal drugs, (1) availability of illegal drugs will decrease; (2) number of (prevalence of) current drug users will decrease; or at least (3) the incidence of new users will decrease; (4) there will be no increase in the negative health consequences related to illegal drugs; and (5) social costs will not increase."
The study, "An Impact Analysis Project of the New Drug Legislation in the Czech Republic" (October 2001), concluded that the implementation of a penalty for possession of illicit drugs for personal use did not meet any of the tested objectives and was loss-making from an economic point of view.
Office of the Czech Government
Secretariat of the National Drug Commission
October 2001