The article examines the importance of observing the procedure for collecting evidence established by the Criminal Procedure Code of Ukraine as a guarantee of their propriety and admissibility, in particular when conducting an examination, when for this there is a need to obtain relevant samples.
 The determined procedure for taking samples from things and documents in criminal proceedings is analyzed for the certainty and unambiguity of the definitions used by the legislator and its compliance with the stated purpose of such an investigative (search) action as obtaining samples for examination. As a result of the analysis, a conclusion is made about the existing conflict of criminal procedural norms, which is a consequence of the lack of definition of the legal regime of certain types of samples for examination in criminal proceedings, taking into account their nature and the replacement of certain procedural categories.
 Attention is focused on the imperfections of the established procedure for taking samples from things and documents in criminal proceedings and the possible consequences of this - the irreversible loss of evidence.
 It is noted that it is impractical to apply the provisions of the established procedure for taking samples from such things and documents that are in the possession of state authorities and local self-government bodies, as well as obtaining an additional court order to conduct a search in case of refusal by the person specified in the decision on temporary access to things and documents, voluntarily provide access to such things and documents for obtaining samples from them.
 Objective factors (embedded in the construction of relevant procedural norms) are determined, which negatively affect the effectiveness of the investigation of criminal offenses, determined by the procedure for taking samples from things and documents established by the Criminal Procedural Code of Ukraine. It is noted that it is inadmissible to use the imperfection of criminal procedural norms to actively oppose the investigation of criminal offenses.
 It is emphasized the urgent need for effective attention of the legislator to the established procedure for taking samples from things and documents in criminal proceedings in order to ensure the effectiveness of obtaining samples for examination as a means of gathering evidence and investigation as a whole.