The Director of the Office of Environmental Policy and Compliance of the United States Department of the Interior sent a letter to the National Telecommunications and Information Administration in the Department of Commerce that addresses the Interior Department's concern that cell tower radiation has had negative impacts on the health of migratory birds and other wildlife.
Introduced by Congressman Dennis Kucinich (D-OH), the purpose of this bill was "To examine, label and communicate adverse human biological effects associated with exposure to electromagnetic fields from cell phones and other wireless devices and for other purposes."
United States Government Accountability Office (GAO)
See pages 40 -44. In this section, Evaluating Mobile and Portable Devices, the 'safe' distance for mobile and portable devices is discussed. The distance is 20cm or approximately 8 inches away from the body. This document is from 1997 and the standards used then are now outdated and erroneous.