The article presents the problem related to the manner of defining a new psychoactive substance. The definition, partly contained in the provisions of the Act on Counteracting Drug Addiction of 2005, as regards the specification of the type of offense, refers to sub-statutory regulations – the ordinance of the Minister of Health. This way of defining the characteristics of a prohibited act raises constitutional doubts from the point of view of the principle of the exclusivity of the act and related rules:
1. Principles of the rule of law expressed in Article 2 of the Polish Constitution by not complying with the requirement of the principle of proper legislation.
2. The principles of nullum crimen sine lege certa arising from Article 42 paragraph 1 of the Polish Constitution, by violating the guarantee function of criminal law by violating the directive on statutory exclusivity and statutory specificity of an act.
3. Principles of the separation of powers resulting from Article 10 of the Polish Constitution by entrusting the executive authority with the powers of the legislative authority.
4. The principles of proportionality expressed in Article 31 paragraph 3 of the Polish Constitution regarding the grounds and scope of admissible limitation of constitutional rights and freedoms and the manner of limiting them.