This is flat out sick and unconstitutional. Get a warrant upon probable cause. That’s it. Otherwise, stay out of our private documents!
“the government asked for even more than just fingerprints”
WTF
I think there was a recent court finding about this kind of search.
http://www.slate.com/blogs/future_tense/2015/09/25/court_rules_that_defendants_don_t_have_to_provide_smartphone_passcodes.html
Evidently, current rulings say that a warrant can force you to provide you fingerprint, but not a passcode. A passcode is part of your mind and is protected by your 5th amendment rights.
So the short answer is if you don't want your phone searched, use a passcode, not a fingerprint.
it was a warrant