Are there any legal or compliance concerns with sending passive ultrahigh-frequency (UHF) tags into nations that have not assigned the 860 to 960 MHz band to RFID systems?
No, the issue is not with tags—the regulations deal with readers. The regulations control the amount of RF energy that can be emitted and the frequencies that can be used in order to prevent interrogators from interfering with other radio transmissions or devices that employ RF signals. If there are no readers operating, then you are not violating any regulations.
—Mark Roberti, Founder and Editor, RFID Journal
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How Much Should Antenna Emission Power Be for a UHF RFID Reader? »