There is not enough arsenic in it for it to be a hazardous substance. There is lead in that stuff as well, and lead poisoning can kill you. Some people will not wear Tibetan silver jewelry and personally I wouldn't have the stuff in the house, but there is nothing so 'wrong' with it as to render it prohibited.
For that matter, plenty of readily available and ostensibly innocuous items are poisonous, like rhubarb leaves, peach pits, and castor beans - injest enough of those and you're dead. Yet you can buy the seeds in greenhouses. Go figure. 🙂
