Interestingly, the authors claim in the paper that batteryless backscattering devices are not regulated by the FCC, citing FCC regs. "Legality: In general, it

Interestingly, the authors claim in the paper that batteryless backscattering devices are not regulated by the FCC, citing FCC regs. "Legality: In general, it is illegal to broadcast random signals on spectrum reserved for TV (or cellular) channels. However, battery free backscattering devices (e.g. RFID tags) are unregulated and not tested by FCC because the emission levels from such devices [7] ... Ambient backscatter also falls into this category, and would therefore be legal under current policies. [7] New policies for part 15 devices, FCC, TCBC workshop, 2005."