In May, he was the subject of a documentary film, Hide and Seek, by Marek and Tomasz Sekielski. The filmmakers brothers provoked a nationwide discussion last year when they released a documentary, Tell No One, addressing clerical abuse in Poland. The film has been viewed almost 24 million times on YouTube.
Their new film accused Janiak of failing to take action against a priest accused of abuse.
On May 16, the day Hide and Seek was released, Archbishop Wojciech Polak, the Primate of Poland, reported the case to the Vatican.
On June 2, the Archdiocese of Poznań announced that the Vatican Congregation for the Bishops had authorized Archbishop Stanisław Gądecki, Janiak's metropolitan archbishop, to conduct a preliminary investigation of the accusations under Vos estis lux mundi, a 2019 motu proprio issued by Pope Francis concerning episcopal accountability.
On June 15, the Polish newspaper Gazeta Wyborcza published a leaked letter from Janiak to fellow Polish bishops criticizing Polak for reporting him to the Vatican.
Gazeta Wyborcza reported June 23 that Janiak was hospitalized in Kalisz in early June with a large amount of alcohol in his system. It said that he was taken home by friends after being given an IV.