An electronic sensor is configured to be carried by a person and to be used by the person to detect a cleanliness state of the person's hands. A single unit includes the electronic sensor and (a) a device to provide an indication of the cleanliness state of the person's hands and/or (b) a device to identify...http://www.google.com/patents/US20080042854?utm_source=gb-gplus-sharePatent US20080042854 - HAND CLEANLINESS
