Talking of Uber. Tostitos are releasing a bag of tottie crisps that if you breathe into will tell you if you have had to much to drink, and will request you an Uber. https://www.thrillist.com/news/nation/tostitos-bag-detects-alcohol-can-request-an-uber-for-you
My own sobriety test is if I have talked to at least 2 munters then I'm too pished to drive.