This incidence took place in Spain. They were detained overnight, after having surprised them putting weed in the censer- burner of the Cathedral of Santiago de Compostela.

The censer-burner is used the Cathedral of Santiago de Compostela to celebrate the Epiphany of the Lord. Several
assistants stated that in this occasion the holy precinct was
suddenly covered in an odd smell.

“it did not smell as always, it was a familiar smell but I could not relate  it to anything, but in my son’s bedroom sometimes smell like that”.

Following the Mass, these altar boys were arrested by the police
after confirming that the strange smell was correspond to marijuana, “it was a joke, the idea came during the Christmas Eve mass, we bought no more than half a kilo of weed and we drop it inside the censer-burner, we are sure that people has left of the Cathedral happier more than ever”.

Finally, they were freed without charge but they will not be able to discharge their functions as altar boys any more.