Responding to a Tribune investigation that found some popular cellphone models measured above federal limits for radiofrequency radiation, the Federal Communications Commission said this week that its own testing found all eight models it evaluated were in compliance.

The testing commissioned by the Tribune, conducted according to federal guidelines at an accredited laboratory in California, examined 11 cellphone models from four manufacturers. The phones were purchased new. Among other findings, the Tribune reported that all four Apple iPhone 7s tested yielded results exceeding the federal limit.

At the time, Apple disputed the results and said the lab used by the newspaper did not test the phones the same way it does.

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