More than 100 different pharmaceuticals have been detected in water throughout Asia, Australia, Canada, and Europe. It's basically a problem everywhere.A lab-on-a-chip, which is referred to as a nanosensor, is being put to use to help monitor what's in drinking water.A lab-on-a-chip is basically about the size of a thumbdrive and has super tiny channels etched into it and as it moves through the channels, the water reacts with various materials (and in some cases nanomaterials) placed within the channels that allows us to detect whatever is to be tested for. In this case, test results come back in few minutes for chemicals like chlorine, fluoride, phosphates and copper.