Final answer:
The FDA has the authority to regulate the safety of tanning beds in indoor tanning salons, and UV radiation from these beds can cause cell damage and potentially lead to skin cancer.
Step-by-step explanation:
The FDA does indeed have the authority to regulate various aspects of tanning salons, particularly regarding the safety of the devices used, such as indoor tanning beds that emit ultraviolet (UV) radiation. While the cosmetic industry primarily ensures product safety and companies must warn consumers if products haven't been tested, the FDA can intervene if there's a risk to public health. Although tanning salons may claim to use "safe" UV radiation with a longer wavelength, no UV radiation is entirely safe. Prolonged exposure to UV radiation, even with a longer wavelength, can lead to cell damage and increase the risk of skin cancer.