u/stillpartofthisworld

For context, I am a PhD student. I am working on a project involving urine and RNA (not important) and I need to collect urine from multiple people. This will involve setting up a station outside department washrooms (across several floors so I can't keep an eye out) for people to grab urine containers and place on ice after they're done. I want to be alerted when someone places their sample on ice so I can go collect them, and I thought of using an NFC tag that people can tap with their phone.

It seems straightforward, but has anyone done it before? Any pitfalls I am not considering?