User's Manual

64
known adverse health effects. Many studies of low-level RF exposures have not
uncovered any biological effects. Although some studies have suggested that some
biological effects may occur, such findings have not been confirmed by additional
research. In some cases, other researchers have had difficulty in reproducing those
studies, and/or determining the reasons for inconsistent results.
3. What are the results of the research done already?
The research conducted 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 it is largely unknown
what the results of such studies mean for human health and safety. Three large
epidemiology studies have been published since December 2000. These studies
investigated possible associations between the use of wireless phones and primary
brain cancer (glioma, meningioma, acoustic neuroma, other brain tumors, and salivary
gland tumors), leukemia, or other types of cancer. None of the studies demonstrated
the existence of any harmful health effects from wireless phone RF exposures.
However, none of the studies can provide absolute findings about long-term
exposures since the average period of phone use in these studies was approximately