&gt; Also, the Breathalyzer measures nothing but alcohol.<p>One would hope but no one in the industry has had their products extensively evaluated for false positives by independent researchers. The way these machines work is entirely handwavy and full of assumptions that aren&#x27;t necessarily true. How you can confidently extrapolate blood alcohol from breath alcohol under loosely controlled test conditions with 4 significant digits across the spectrum of human physiology has never been explained.<p>I would be doubly afraid of false positives from a textalyzer triggered by some app that accesses texts automatically. There will be no recourse to prove the state wrong.