This is what really concerns me, and why I&#x27;ve avoided using &#x27;google now&#x27; on my phone. With this data, google could easily construct a &#x27;voice signature&#x27; for every one of their users. And those voice signatures are just one FISA warrant away from falling into the hands of various national security agencies.<p>I would rather google had my DNA on file if I had to choose between the two. Why? Because voice signatures can be used to passively authenticate&#x2F;identify someone without them even realising they&#x27;ve been authenticated&#x2F;identified. You just need control of a nearby microphone while they happen to be talking. At least with DNA, I&#x27;d probably notice someone jabbing a needle in my arm or sticking a cotton swab in my mouth.