In the Junk Drawer tonight: Could wastewater be the new key to fighting illegal drug abuse?Researchers at Oregon state university and the University of Washington wanted to see if they could find a way to track the use of illegal drugs in cities of all sizes.Knowing that what goes in must, come out -- they used wastewater to test for methamphetamine, cocaine and ecstasy.Scientists say if they can track drug trends over time, it'll help authorities better allocate resources to fight drug use.