Too drunk to drive? Calling a cab is a Breeze with new smart breathalyser

A LITTLE HELP: Breathometer's new smart breathalyser, the Breeze, attaches to your keys. — Breeze from Breathometer

Breathometer has unveiled a small, sleek breathalyser that connects via Bluetooth to a corresponding smartphone app upon which it reveals blood alcohol content readings. 

The device is conveniently small enough to fit in a pocket and wearable if used with the included clip. Use the included keychain ring and it's easy to get into the habit of making sure you're in a sober state before driving.