A federal appeals court has blocked implementation of San Francisco's cellphone radiation warning law pending the outcome of an industry challenge.
The ordinance, believed to be the first of its kind in the nation, requires cellphone dealers to tell customers the devices may expose them to cancer-causing radiation levels.
It was scheduled to take effect last October but it has been on hold because of court challenges.
The San Francisco Chronicle ( says the 9th U.S. Circuit Court of Appeals on Monday barred enforcement while the case continues.
The ordinance requires retailers to give cellphone buyers a fact sheet saying the World Health Organization classifies cellphone radio-frequency emissions as possible carcinogens.
The appeals court says the city can't force retailers to pass along messages they dispute.