True or false? sewage epidemiology monitors levels of excreted drugs in the sewer system in order to assess the level of illicit drug use in a community.

The above statement is true. The sewage epidemiology involves monitoring the levels of excreted drugs in the sewer system in order to assess the level of illicit use in the community. It is an approach that uses waste water analysis for assessing collective exposure of the members of a community to a wide range of chemicals. The chemical investigated includes those voluntarily ingested such as illicit drugs, pharmaceuticals and those to whom subjects are involuntarily exposed to. 

Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.