iOS 11 has a 'cop button' to temporarily disable Touch ID
 

Apple is adding an easy way to quickly disable Touch ID in iOS 11. A new setting, designed to automate emergency services calls, lets iPhone users tap the power button quickly five times to call 911. This doesn't automatically dial the emergency services by default, but it brings up the option to and also temporarily disables Touch ID until you enter a passcode. Twitter users discovered the new option in the iOS 11 public beta, and The Verge has verified it works as intended. It's sad that we live in a world where our devices need features like this, but I commend Apple for doing so.

http://osnews.com/story/29968/iOS_11...ble_Tou ch_ID