BILGE PURGING BAN IS RECKLESS PARALYSIS. “An early environmental application of the precautionary principle involved the prohibition of the purging of ship bilge contents and other wastes into the oceans. This requirement was justified by the paucity of data on the effects of the purged substances. Hence, a scientific risk assessment on this practice was not possible.”
http://www.agbioforum.org/v3n4/v3n4a13-hathcock.htm