The North American Amphibian Monitoring Program (NAAMP) has been collecting data on frog populations, but this study is pointing out that these data are flawed. NAAMP uses volunteers, who have to study local frog calls and pass a quiz with a certain percentage of correct identifications, to collect these data. The issue is that many volunteers are getting it wrong, and are indicating that certain species are calling when they are not. NAAMP's volunteer screening process isn't effective.