A corpse is considered a host for decay, i.e., of "druj". Consequently, scripture enjoins the safe disposal of the dead in a manner such that a corpse does not pollute the good creation. These injunctions are the doctrinal basis of the fast-fading traditional practice of ritual exposure, most commonly identified with the so-called Towers of Silence for which there is no standard technical term in either scripture or tradition. Ritual exposure is currently mainly practiced by Zoroastrian communities of the Indian subcontinent, in locations where it is not illegal and diclofenac poisoning has not led to the virtual extinction of scavenger birds. Other Zoroastrian communities either cremate their dead, or bury them in graves that are cased with lime mortar, though Zoroastrians are keen to dispose of their dead in the most environmental way possible.