Marek was first detained on September 9, 2020, at his place of study, but was later released on bail. However, in February 2021, he was detained again in a criminal case opened after spontaneous protests that took place on August 10, 2020, in Brest against the falsification of the presidential elections. He was convicted of participating in "mass riots."
According to human rights activists, he was released in November 2024, having fully served his sentence.
