Muslim "Holy Water" Laced with Arsenic

The FSA have declared that "holy water" being sold in Britain has three times the normal levels of arsenic in them. Its good that the FSA have stopped the selling of this water because arsenic can lead to cancer.

What puzzles me, though, is that the FSA declared that genuine Zam Zam water (this Muslim holy water) cannot be exported from Saudi Arabia for commercial purposes. This begs the question of why it was allowed to be sold in the first place.