Singapore it always ahead of the curve in keeping tabs on its citizens but I can only see bad things when someone realizes you can tie this data to other public data. At the same time I can see a great use for this for public safety.
The Analyzer is a series of custom urine testing devices that can reset instantly for consecutive readings from multiple patrons. These devices are paired with an RFID reader and when patrons park their car, they exchange their car keys for parking cards containing RFID tags. These tags can then be used to identify the patrons and record their alcohol levels.