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including the following:

 "Support needed research into possible biological effects of RF of

the type emitted by wireless phones;

 "Design wireless phones in a way that minimizes any RF exposure

to the user that is not necessary for device function; and

 "Cooperate in providing users of wireless phones with the best

possible information on possible effects of wireless phone use on

human health.

FDA belongs to an interagency working group of the federal agencies that

have responsibility for different aspects of RF safety to ensure coordinated

efforts at the federal level. The following agencies belong to this working

group:

 "National Institute for Occupational Safety and Health

 "Environmental Protection Agency

 "Federal Communications Commission

 "Occupational Safety and Health Administration

 "National Telecommunications and Information Administration

The National Institutes of Health participates in some interagency working

group activities, as well.

FDA shares regulatory responsibilities for wireless phones with the Federal

Communications Commission (FCC). All phones that are sold in the United

States must comply with FCC safety guidelines that limit RF exposure.

FCC relies on FDA and other health agencies for safety questions about

wireless phones.

FCC also regulates the base stations that the wireless phone networks

rely upon. While these base stations operate at higher power than do the

wireless phones themselves, the RF exposures that people get from these

base stations are typically thousands of times lower than those they can

get from wireless phones. Base stations are thus not the primary subject

of the safety questions discussed in this document.

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 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 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.