Five lawsuits alleging Nokia failed to warn that cell phones emit “unsafe” radiation were kicked back to state courts, following a federal appeals court decision this week. The U.S. Appeals Court for the Fourth District returned the cases to state courts because they lacked federal issues. The ruling did not reach a conclusion on the merits of the cases or whether cell phones are a health hazard. The five lawsuits allege that mobile phones emit unsafe levels of radio frequency radiation and that Nokia has put the public at risk by marketing the devices without headsets.