Healthcare involves sharing sensitive information. In health, access control technologies tend to involve patient records. However, as healthcare is becoming increasingly pervasive, it is necessary to control access to live information streams, such as those from sensor devices. As opposed to bespoke, scenariospecific access control regimes, the middleware enforcement of access policy enables application-/device-independent regulation of data disclosure, tailored to general representations of context. This paper presents a scenario where the information flowing from sensors is controlled as appropriate to circumstance.