User Guide

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reliable proof of a cancer promoting effect if one exists. Epidemiological studies can provide data
that is directly applicable to human populations, but 10 or more years’ follow-up may be needed
to provide answers about some health effects, such as cancer. This is because the interval between
the time of exposure to a cancer-causing agent and the time tumors develop - if they do -may
be many, many years. The interpretation of epidemiological studies is hampered by difficulties in
measuring actual RF exposure during day-to-day use of wireless phones. Many factors affect this
measurement, such as the angle at which the phone is held, or which model of phone is used.
6. What is FDA doing to find out more about the possible health effects of wireless
phone RF?
FDA is working with the U.S. National Toxicology Program and with groups of investigators around
the world to ensure that high priority animal studies are conducted to address important questions
about the effects of exposure to radiofrequency energy (RF). FDA has been a leading participant in
the World Health Organization International Electromagnetic Fields (EMF) Project since its inception
in 1996. An influential result of this work has been the development of a detailed agenda of
research needs that has driven the establishment of new research programs around the world. The
Project has also helped develop a series of public information documents on EMF issues. FDA and
the Cellular Telecommunications & Internet Association (CTIA) have a formal Cooperative Research
and Development Agreement (CRADA) to do research on wireless phone safety. FDA provides
the scientific oversight, obtaining input from experts in government, industry, and academic
organizations. CTIA-funded research is conducted through contracts to independent investigators.
The initial research will include both laboratory studies and studies of wireless phone users. The
CRADA will also include a broad assessment of additional research needs in the context of the latest
research developments around the world.
7. How can I find out how much radiofrequency energy exposure I can get by using my
wireless phone?
All phones sold in the United States must comply with Federal Communications Commission (FCC)
guidelines that limit radiofrequency energy (RF) exposures. FCC established these guidelines in