Too late!
We had our annual office shin-dig last week, and there were many who could have used this little gadget. Never mind. It was perfectly possible to tell who was completely blasted and who was slacking off in order to maintain some degree of dignity without such a device, so I have to agree with mark16_15 really. It sounds more like an opportunity for further sporting endeavours then a timely reminder that enough was enough.
As Dean Martin put it, "You're not drunk if you can lie on the floor without holding on." I'm not sure they make an app' for that though.