A potential argument for making the Breathalyzer mandatory is that the alcohol dissipates over time, and has to be detected while it&#x27;s still present. Also, the Breathalyzer measures nothing but alcohol.<p>There&#x27;s no such immediacy with phone activity, especially since phone logs are stored permanently somewhere other than the phone. If the police need to search the driver&#x27;s phone records, they can tell it to a judge and get a search warrant. So the analogy to the Breathalyzer just isn&#x27;t a good one.<p>And, a casual search of phone records could turn up all sorts of stuff, encouraging use of the Textalyzer as a pretext for conducting a broader search.