Despite the FBI and other law enforcement agencies asking for warrantless wiretaps and the end of encryption programs -- What percentage of wiretap applications were approved in 2015?
4,148 wiretaps were asked for in 2015
"Of note is that despite FBI director James Comey’s repeated insistence of an endemic of terrorists and other criminals “going dark”—using chat programs that use end-to-end encryption, like iMessage or WhatsApp, making it impossible to easily understand a wiretapped message—only six federal wiretaps were reported encrypted in 2015, and two of those were successfully decrypted."