By using a wiretapping law for the first time since it entered into force in 2000, the Metropolitan Police Department has arrested nine suspects and put another on a wanted list in a drug case, the MPD said Thursday.
Tokyo police said they wiretapped conversations on two mobile phones over about 10 days from late January through early February.
The law allows investigators to tap phones, faxes and e-mail in investigations when it is difficult to build a case using other means.