People, animals, are using drugs, and dumping and urinating them back into our systems. Hospitals are dumping drug leftovers down our drains and sewers. Trains and trucks carrying cargoes of drugs spill, set ablaze, and introduce these drugs into our environments in many ways, For example, check this story.

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Toxic waste from clandestine drug labs
http://www.makesmartchoices.org/toxic_water.htm