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distance from the source. The so-
called 'cordless phones, ' which have a
base unit connected to the telephone
wiring in a house, typically operate
at far lower power levels, and thus
produce RF exposures far below the
FCC safety limits.
4. What are the results of the
research done already?
The research done thus far has
produced conflicting results, and
many studies have suffered from
flaws in their research methods.
Animal experiments investigating the
effects of radiofrequency energy (RF)
exposures characteristic of wireless
phones have yielded conflicting
results that often cannot be repeated
in other laboratories. A few animal
studies, however, have suggested that
low levels of RF could accelerate the
development of cancer in laboratory
animals. However, many of the
studies that showed increased tumor
development used animals that
had been genetically engineered or
treated with cancer causing chemicals
so as to be pre-disposed to develop
cancer in the absence of RF exposure.
Other studies exposed the animals to
RF for up to 22 hours per day. These
conditions are not similar to the
conditions under which people use
wireless phones, so we don't know
with certainty what the results of
such studies mean for human health.
Three large epidemiology studies
have been published since December
2000. Between them, the studies
investigated any possible association
between the use of wireless phones
and primary brain cancer, glioma,
meningioma, or acoustic neuroma,
tumors of the brain or salivary gland,
leukemia, or other cancers. None
of the studies demonstrated the
existence of any harmful health effects
from wireless phone RF exposures.
However, none of the studies can
answer questions about long-term
exposures, since the average period
of phone use in these studies was
around three years.
5. What research is needed to
decide whether RF exposure from
wireless phones poses a health
risk?
Acombination of laboratory studies
and epidemiological studies of people
actually using wireless phones would
provide some of the data that are
needed. Lifetime animal exposure
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