Health and Safety 127Consumer Information on Wireless Phones Health and Safetybecause the interval between the time of exposure to a cancer-causingagent and the time tumors develop - if they do - may be many, manyyears. The interpretation of epidemiological studies is hampered bydifficulties in measuring actual RF exposure during day-to-day use ofwireless phones. Many factors affect this measurement, such as theangle at which the phone is held, or which model of phone is used.What is the FDA doing to find out more about the possiblehealth effects of wireless phone RF?FDA is working with the U.S. National Toxicology Program and withgroups of investigators around the world to ensure that high priorityanimal studies are conducted to address important questions aboutthe effects of exposure to radio frequency energy (RF).FDA has been a leading participant in the World Health Organizationinternational Electromagnetic Fields (EMF) Project since its inceptionin 1996. An influential result of this work has been the developmentof a detailed agenda of research needs that has driven theestablishment of new research programs around the world. TheProject has also helped develop a series of public informationdocuments on EMF issues.FDA and Cellular Telecommunications & Internet Association (CTIA)have a formal Cooperative Research and Development Agreement(CRADA) to do research on wireless phone safety. FDA provides thescientific oversight, obtaining input from experts in government,industry, and academic organizations. CTIA-funded research isconducted through contracts to independent investigators. Theinitial research will include both laboratory studies and studies ofwireless phone users. The CRADA will also include a broadassessment of additional research needs in the context of the latestresearch developments around the world.