Tracking the coronavirus pandemic could soon be a bit easier because of one simple fact: everyone poops.

Around the world , wastewater plants have become unlikely sentinels in the fight against the virus, allowing scientists to track the disease's spread at the community level. The practice of testing sewage samples is spreading across Western U.S. states as well, with programs currently running in Utah, Nevada, Arizona and California.

A Utah-based company called Domo is showing public health agencies in the Mountain West where their COVID-19 transmission risk is coming from. Among other things, the service uses cell phone location data to identify which counties and states visitors are coming from, and pairs it with data about how bad the local COVID-19 outbreak is there. Public health officials in Southwest Colorado say the tool has shown that at the moment, the most active people in the area are people normally based in Texas, followed by people usually based in Arizona. 

Updated 5:32 p.m. ET

Former President Barack Obama delivered the eulogy Thursday at the funeral of civil rights legend Rep. John Lewis in Atlanta.

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