User's Manual

E-13
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.
I 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