Why are some imported (to the U.S.) intentional radiators (such as
RC toys, fitness heart-rate monitors, etc.) not FCC EMC Part 15
certified (there is no FCC OET record on file)? These have CE
EMC Certification and a CE 'number'; is there a treaty that
exempts such devices from further FCC certification? Is there
a publicly accessible database of CE 'numbers' similar to the
FCC OET filings? I have found nothing of use on the 'net in
these matters?


Probably because of a similar reason that toys have lead. Customs
agents too busy looking for drugs and such to worry about some paperwork
issue... And years ago I heard an FCC guy say that they frequently see
bogus FCC certification file numbers on stuff.