The loosely coupled BLE data collection framework enables new ways of architecting Internet of Things and Humans (IoTH) systems. An example application is to monitor the hand sanitization status of healthcare personnel (HCP) in an intensive care unit (ICU) to control and prevent the spread of hospital acquired infec- tions (HAIs), where unclean hands are the most common factor contributing to this cause. Clean- Hands [15] is a recently proposed system that uses a combination of BLE beacon tags and HCP’s mobile phones for detecting occurrences of noncompliance with hand hygiene. This appli- cation requires different levels of time accuracy. For instance, a few milliseconds may be sufficient to disambiguate the handwashing event of HCPs, but a significantly higher accuracy level of a few microseconds would be required to secure the same system against possible gaming