Can you piss into a bottle of mineral water and test it for impurities at the same time?
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/vanishing-point-0
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/tehelka-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tata-iron-and-steel-tisco
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ports
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/turtles
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bhitarkanika-np
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/orissa