You good to drive? Unfortunately the answer to that question isn’t always the right one, and if a cop has to answer it for you it’s a good bet they’ll be getting the truth. One of the reasons is that they can actually see how much you’ve had to drink by measuring it in your breath. Of course nobody should hop in a car after drinking any amount, but with the BACtrack Vio Smartphone Breathalyzer, you can take the role of cop before one rolls up on you or your friends if there’s any question. It’s a disaster averting tool that you can get for just $39.99 at Cult of Mac Deals.