At least until the myriad of iPhone data extraction tools being sold to the police finds a way to extract that, too. This one is apparently already compatible with iOS8:

http://www.accessdata.com/solutions/digital-forensics/mobile...

And from what I've noticed Apple is pretty quite about fixing vulnerabilities that these kind of tools used (i.e. the kind of vulnerabilities that need your phone to work - which is exactly the kind of power say someone like the police has).