You’ll breath easy with the Digital Breathazlyer from BACTrack.  Aside from knowing if you’re too trashed to drive, you don’t have to place your mouth on a bacteria infested straw; just blow into the front of the device.  It’ll measure your drunkness on a scale of 0.00 – 0.40% BAC, has an easy to read LCD display and features an indicator light to tell you when to start and stop blowing.

Available here for $80