From http://ncronline.org/blogs/ncr-today/csi-meets-catechism

Just when you think you’ve seen it all or Technology inside the church, Polish-style
“A Polish priest has installed an electronic reader in his church for schoolchildren to leave their fingerprints in order to monitor their attendance at Mass, the Gazeta Wyborcza daily said Friday.
The pupils will mark their fingerprints every time they go to church over three years and if they attend 200 Masses they will be freed from the obligation of having to pass an exam prior to their confirmation, the paper said.
The pupils in the southern town of Gryfow Slaski told the daily they liked the idea and also the priest, Grzegorz Sowa, who invented it.

A major hat tip to my colleague, Patty Spear for pointing this my way.