"When investigations of violent criminal organizations come to a halt because we cannot access a phone, lives may be lost. When child molesters can operate anonymously over the internet, children may be exploited. When terrorists can communicate covertly without fear of detection, chaos may follow," Mr. Rosenstein said.
"Maybe we eventually will find a way to access the data. But it costs a great deal of time and money. In some cases, it surely costs lives. That is a very high price to pay," Mr. Rosenstein said Thursday. "We need to find a solution."