NFC tag against a double dose

Giving medicine to a child and then not being sure whether it already happened is a nasty feeling, especially when two people share the job.

So there is now an NFC tag involved, a small sticker that a phone recognises when held against it. Whoever gives the dose holds their phone to the tag, and the time is recorded.

That way nobody has to rely on memory or shouted questions from another room. One glance answers it.