title: Voice authentication in Android app
body: <p>Is it possible to integrate voice authentication into my app? I'm not interested in recognising voice commands - rather I am interested in detecting <em>who</em> is speaking. I know Lollipop had a 'Trusted Voice' screen unlock system a while ago but I can't see it anymore on my version of Android (6.0.1). If it still exists, is it possible to use this 'Trusted Voice' authentication method in my app?</p>
  
  <p>Is voice authentication possible using the standard Android API - or is a third party library required?</p>