(CNN) Polish police say Elżbieta Podlesna put up posters of the revered Black Madonna that showed the Virgin Mary and Jesus with rainbows from the LGBT flag as the halos. Now she could face two years in prison for offending religious feelings.

Police claim that Podlesna, 51, put up the posters in the small city of Płock, Poland. And they say they found even more posters when they searched her car and home.

Podlesna was detained by authorities as she returned from an Amnesty International advocacy tour.

As a result of the searches, prosecutors are charging her with offending religious feelings. And those charges mean Podlesna faces up to two years in prison if found guilty.

CNN is identifying Podlesna because she has agreed to reveal her name to the media. Normally under Polish law, it is illegal to report the name of a suspect until the trial is over.

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