The beatification process for the late prelate opened in the Kraków archdiocese under Cardinal
Franciszek Macharski in a diocesan process that launched on 18 March 1994 and closed on 24 April 2001; its task was to accumulate documentation (including his spiritual writings) and witness interrogatories. The formal launch to the cause came on 7 July 1994 after the
Congregation for the Causes of Saints in
Rome issued the "
nihil obstat" (no objections) decree and titled Pietraszko as a
Servant of God. The C.C.S. later validated this process on 22 February 2002 as having adhered to the congregation's regulations for conducting causes. In 2012 the postulation (officials in charge of the cause) submitted the
Positio dossier to the C.C.S. officials. This dossier was the culmination of all the evidence gathered during the diocesan phase; it detailed the late bishop's life and his reputation for holiness thus making the official argument for his becoming a saint. Theologians approved the dossier on 27 February 2018 as did the C.C.S. cardinal and bishops months after. Pietraszko became titled as
Venerable on 21 December 2018 after
Pope Francis confirmed that he had practiced
heroic virtue during his lifetime. The first
postulator assigned to the cause was
Stanisław Ryłko who had been a student of Pietraszko. The current postulator for this cause is
Monsignor Właysław Gasidło. ==Writings==