The article presents the issue of the validity of a notarial testament, with particular regard to questioning its authenticity and raising the issue of lack of testability on the part of the testator based on art. 82 and art. 945 of the Civil Code. In the further part of
the study, formal requirements for the validity of the notarial testament have been described and the subject matter of the handwriting expertise of the notarial testament on the basis of the results of the conducted researches.