Section 4A: Safety Guidelines 161In 1996, the World Health Organization (WHO) established the InternationalEMF Project to review the scientific literature and work towards resolution ofhealth concerns over the use of RF technology. WHO maintains a Web site thatprovides extensive information on this project and about RF biological effectsand research (www.who.ch/peh-emf).FDA, EPA and other US government agencies responsible for public health andsafety have worked together and in connection with WHO to monitordevelopments and identify research needs related to RF biological effects.How does FCC Audit Cell Phone RF?After FCC grants permission for a particular cellular telephone to be marketed,FCC will occasionally conduct “post-grant” testing to determine whetherproduction versions of the phone are being produced to conform with FCCregulatory requirements. The manufacturer of a cell phone that does not meetFCC's regulatory requirements may be required to remove the cell phone fromuse and to refund the purchase price or provide a replacement phone, and maybe subject to civil or criminal penalties. In addition, if the cell phone presents arisk of injury to the user, FDA may also take regulatory action. The mostimportant post-grant test, from a consumer's perspective, is testing of the RFemissions of the phone. FCC measures the Specific Absorption Rate (SAR) ofthe phone, following a very rigorous testing protocol. As is true for nearly anyscientific measurement, there is a possibility that the test measurement may beless than or greater than the actual RF emitted by the phone. This differencebetween the RF test measurement and actual RF emission is because testmeasurements are limited by instrument accuracy, because test measurementand actual use environments are different, and other variable factors. Thisinherent variability is known as “measurement uncertainty.” When FCCconducts post-grant testing of a cell phone, FCC takes into account anymeasurement uncertainty to when determining whether regulatory action isappropriate. This approach ensures that when FCC takes regulatory action, itwill have a sound, defensible scientific basis.FDA scientific staff reviewed the methodology used by FCC to measure cellphone RF, and agreed it is an acceptable approach, given our currentunderstanding of the risks presented by cellular phone RF emissions. RFemissions from cellular phones have not been shown to present a risk of injuryto the user when the measured SAR is less than the safety limits set by FCC (anSAR of 1.6 w/kg). Even in a case where the maximum measurementuncertainty permitted by current measurement standards was added to themaximum permissible SAR, the resulting SAR value would be well below anylevel known to produce an acute effect. Consequently, FCC's approach withmeasurement uncertainty will not result in consumers being exposed to anyknown risk from the RF emitted by cellular telephones.FDA will continue to monitor studies and literature reports concerning acuteeffects of cell phone RF, and concerning chronic effects of long-term exposureto cellular telephone RF (that is, the risks from using a cell phone for manyyears). If new information leads FDA to believe that a change to FCC'smeasurement policy may be appropriate, FDA will contact FCC and bothagencies will work together to develop a mutually-acceptable approach.