In this article, the authors discuss the extremely delicate and highly controversial issue of lustration proceedings. Although - to some extent - it is understandable that social sentiments towards persons subjected to lustration (vetting) may vary, it should be borne in mind that it is not the role of state au-thorities to blindly submit to vox populi. Instead, they should ensure the hi-ghest degree of implementation of the guarantees to which individuals and ci-tizens are entitled. This article discusses such issues as: the concept of lustration, the nature of „work” in, „cooperation” with, and „assistance” to state authorities, the awareness of the worker, collaborator and assistant, the nature of lustration proceedings, the right to defence in lustration proceedings and negative procedural grounds in lustration proceedings. The considerations pre-sented here warrant the conclusion that the current legal regulations - if interpreted incorrectly - may lead to a violation of the basic rights of an individual. It may happen that a purely formal approach in lustration cases may lead to an obviously unfair decision being issued, and thus to a failure to comply with the constitutional obligations of ordinary courts, which they have in the light of Article 175(1) of the Constitution of the Republic of Poland.