The news that a 51-year-old activist, Ms Elżbieta Podleśna, was detained and interrogated by Polish authorities shocked the public in Poland. She is charged under Poland’s “blasphemy law” for allegedly putting up posters of the Virgin Mary with a rainbow halo. This latest example of Polish authorities prosecuting cases of religious insults illustrates the incompatibility of Poland’s “blasphemy law” with European human rights guarantees, in particular the freedom of expression.