Does anyone know if it's legal to use non FCC-approved radio devices which are purchased locally? For instance, if the device is purchased from a local eBay seller, is it still legal to use it in any setting (commercial or otherwise)? AFAIK it is the importer's responsibility to ensure the device imported is compliant. So my take is that it is illegal to use unapproved devices bought from foreign sellers only. Is it correct?
EDIT: I'm referring to USA in particular.