Earlier quoted context omitted.
Apple gives data to the United States government on over 70,000 user accounts per year without a warrant. Anything Apple knows, the FBI can know, without probable cause.
Not doubting this whatsoever, but what are you citing here?
Per the Snowden slides, this (FAA702 collection) is the #1 most used collection method by US spies.
They can basically read approximately every camera roll and iMessage in the country with a few clicks.