Five female college students posed as pale 15-year-old girls in need of tans. They called 3,647 indoor tanning facilities across the country and inquired about making tanning appointments. They asked if they would need written permission from their parents or if their parents would need to come with them. They also asked how many times they could tan during the first week. The undercover operation was orchestrated by researchers from California, Minnesota and Rhode Island who wanted to assess how tanning businesses complied with laws and federal guidelines regarding exposure to ultraviolet radiation.