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greater distances from the user, the exposure to RF is
drastically lower because a person’s RF exposure decreases
rapidly with increasing 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
Radio Frequency (RF) energy 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 do
not 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?
A combination of laboratory studies and epidemiological
studies of people actually using wireless phones would provide
some of the data that are needed. Lifetime animal exposure
studies could be completed in a few years. However, very large
numbers of animals would be needed to provide reliable proof
of a cancer promoting effect if one exists. Epidemiological
studies can provide data that is directly applicable to human
populations, but ten or more years follow-up may be needed
42


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