A visitor verification system 1000 is disclosed and described that can automatically authenticate a Mobile Service Provider (MSP) 3 arriving to provide assistance to a patient, or client 5 at their residence 7 while being off-line with the agency server. It also verifies the time and location a MSP session begins, periodically verifies that the MSP 3 is within the client's residence 7, logs the MSP out of the system and reports on the session. The visitor verification system employs at least one visual code located at the residence 7 that is scanned by a mobile computing device (MCD) 100. Information in the visual code is decoded and reconciled with locations determined by executable code (the App) running on the MCD 100. Once the location is verified by the App/MCD 100, the MSP 3 is authenticated. The system includes at least one beacon that transmits a signal that the MSP receives on the MCD 100. The received signal can be used to determine the MSP's distance from the beacon or to monitor the MSP's locations throughout the session. Information acquired during the session may be uploaded immediately, or at a later time when network connectivity is available, through a network 13 to a server 400 to be used by the system.