San Fransico's Board of Supervisors approved an ordinance on June 17, 2010 that requires retailers to post notices on how much radiation is emitted by cell phones that they sell.
The regulation is believed to be the first of its kind in the country, and ratchets up the heated and ongoing debate about whether radiation from cell phones causes cancer.
The ordinance would require retailers to post, in at least 11-point type, each phone's specific absorption rate (SAR), as reported to the U.S. government.
The cell phone industry, in opposing the San Francisco council's ordinance, argued that it could impede sales.
John Walls, a spokesman for CTIA - The Wireless Association told the Associated Press that the regulation might also confuse consumers into thinking some phones are safer than others.
According to reports, San Fransicco Mayor Gavin Newsom is expected to sign the ordinance into law after a 10-day comment period.
A flux of studies have been released the last couple years about the health effects of cellphone radiation. One of the most recent, published in May 2010 in the International Journal of Epidemiology found no increased risk for the two most common types of brain tumors.
The journal study also concluded that in the most extreme cellphone uses, there was a small increase in a type of cancer that attacks the cells that surround nerve cells, but its researchers found that finding inconclusive.
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