Abstract
Prohibition of using evidence obtained contrary to the law is defined in the views of legal scholars and commentators and in the literature as the doctrine of the fruits of the poisonous tree. The aim of the paper is to discuss the subject matter of limiting the freedom of proof both on the ground of criminal procedure, especially through the lens of Article 168a CCrP (Act of 6 June 1997 The Code of Criminal Procedure, consolidated text, Dz. U. (Journal of Laws) of 2018 item 1987 as amended) and administrative procedure. The author stays convinced that the above-mentioned theory should be applied in both these types of procedures, primarily due to the constitutional right afforded to everyone to a public, fair and lawful examination of a given case by public and investigative authorities.
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