LAS VEGAS — At CES 2017, we previewed some of the coolest health tech set to hit the market. From a brand new take on the electric breast pump to a discreet way to check sobriety during a night on the town, trust us, there's a lot of neat stuff on the horizon. The Proof wearable wants to help drinkers keep an eye on their BAC levels. The company behind this wristband claims it can measure alcohol molecules through your skin and send data to its corresponding app on your smartphone.