12. The method of claim 11 , further comprising: prior to receiving the voluntary check-in: receiving, from the remote server, a second alert requiring the enrollee to perform a second check-in; receiving a second acknowledgement of the second alert from the enrollee; determining that the second acknowledgement has not been received within a pre-defined response period; and recording, based on the determining, the second check-in as a missed check-in.
11. The method of claim 1 , further comprising: receiving, from the enrollee, a voluntary check-in after the first check-in is missed.