An Invention For One To Tell If They Are Over The Legal Limit Of Blood-Alcohol Should One Trust Both The System To Dictate A Legal Limit And Also That One Should Have Trust In The System They Are Part Of

In a government, should they have a law regarding the legal blood-alcohol limit that one may have, a work around for drinking on the go, and possibly for other purposes, could be a combination flask-breathalyzer.  It could light up or vibrate should one have gone over the legal limit in their country and, as such, it could enable a warning before public drunkenness or public driving might have taken hold.  There is always a way for certain people to attempt to fool the system but this bedrock foundational tool could enable one to experience the freedom of drink practically anywhere yet also give one an excuse at a party to still stay sober yet fit in with a crew at the party.

Possible response to being offered a drink:

"(I'm) not into drinking but I'm down for a shot to celebrate!"