A couple of weeks ago, the New York Times Magazine published its 2007 “Year in Ideas” issue — their annual compendium of the year’s most interesting and offbeat research. I wrote up five of their scientific and technological entries. The entire issue is online here for free, but I’m also archiving my pieces here for posterity’s sake.

This one’s about “community urinanalysis”! The illustration, by Cybu Richli, accompanied it.

Community Urinalysis

Everyone knows how a drug test works: You urinate into a cup and your employer (or prospective employer) has the sample tested to see if you’ve been using any illegal substances. This year, though, Jennifer Field, an environmental chemist at Oregon State University, experimented with an unusual variation on this process. She found out what illicit drugs the population of an entire city was ingesting.

How? By collecting and then testing water from the city’s sewage-treatment plant. Since all drug users urinate, and since the urine eventually winds up in the sewers, Field and her fellow researchers figured that sewer water would contain traces of whatever drugs the citizens were using.

Sure enough, when Field’s team tested a mere teaspoonful of water from a sewage plant — which it ultimately did in many American cities — the sample revealed the presence of 11 different drugs, including cocaine and methamphetamine.