Apparently not to be foiled by fingerprint security on your cell phone, judges are now allowing warrants that compel people to provide fingerprints to unlock phones. As can be expected, this is not going over well in the constitutional law community.
Per Forbes:
http://www.forbes.com/sites/thomasbrewster/2016/10/16/doj-demands-mass-fingerprint-seizure-to-open-iphones/#b06209a8d9d2 (http://www.forbes.com/sites/thomasbrewster/2016/10/16/doj-demands-mass-fingerprint-seizure-to-open-iphones/#b06209a8d9d2)
Feds Walk Into A Building, Demand Everyone's Fingerprints To Open Phones
In what's believed to be an unprecedented attempt to bypass the security of Apple iPhones, or any smartphone that uses fingerprints to unlock, California's top cops asked to enter a residence and force anyone inside to use their biometric information to open their mobile devices.
Regrettable but logical extension of that stupid exception that your skin cells, follicles, fingerprints, a physical key to a safe, etc., things like that don't constitute self incrimination because they're merely physical evidence and not testimonial. Which is asinine, but whatever. Your best bet is a lengthy passcode without the biometrics. The way apple wipes the device after a small number of attempts, that's essentially impossible for them to work around. In the event anybody manages to get an order requiring you to turn over the passcode over from memory (a real uphill battle) then "oops sorry, i forgot it" puts an end to it.