A cable lock includes a belt, a lock body, a first clamp unit, a second clamp unit, and a switch unit. A record module is included to create a record that includes a member identifier, a member type, and an ancestor list for a member of a hierarchical data structure. A start octet is inserted in a first time slot of each multi-frame and the sequence number within the start octet is used to count the number of multi-frames. These described methods and compositions can be used for providing indicators of myocardial infarction and other cardiac pathologies. A measured electrical resistance that differs from a nominal electrical resistance is indicative of a covering that is being tampered with and an alert is communicated to an observer.