"...with medical science indicating increased risks of tumors, cancer, genetic damage and other health problems from the use of cellphones, the government and the cellphone industry have abandoned the public."
he changed his opinion in the face of accumulating evidence about the dangers and wrote a book about it.
A scientist who maintains that mobile phones are safe to use is either corrupt or seriously incompetent.
Furthermore, the data may have been faked so as to suit the intersts of the sponsor. In other cases there may be a hidden influence (read corruption) from the industry.