In a study at Western Connecticut State University, subjects performed outdoor field work while wearing clothing impregnated with the pesticide permethrin, which can deter many types of arthropods, including human-biting ticks. The clothes were worn and washed 16 times over an eight-week period and then tested to determine what effect the usage and laundering had on the repellency of the permethrin in the clothing. (Photo credit: Peggy Stewart, Western Connecticut State University)