User guide

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 devices.

Many factors affect this measurement, such as the

angle at which the device is held, or which model of

device is used.

6. What is FDA doing to find out more about the

possible health effects of wireless device 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