Verified access to a monitored property

1. A monitoring system that is configured to monitor a property, the monitoring system comprising:

a sensor that is located at the property and that is configured to generate a biometric identifier of a visitor;

a monitor control unit that is configured to:

receive, from the sensor, the biometric identifier of the visitor;

compare the biometric identifier to a stored biometric identifier of a known visitor

based on the biometric identifier corresponding to a stored biometric identifier of the known visitor, receive location information that corresponds to locations of the known visitor during a time period before receiving the biometric identifier of the visitor;

based on biometric identifier corresponding to the stored biometric identifier of the known visitor and the location information of the known visitor during the period of time before receiving the biometric identifier of the visitor, determine a confidence score that reflects a likelihood that the visitor is authorized to access the property;

based on the confidence score that reflects the likelihood that the visitor is authorized to access the property, select, from among multiple monitoring system actions, a monitoring system action; and

perform the monitoring system action.

2. The system of claim 1 , wherein the monitoring control unit is configured to perform the monitoring system action by disarming the monitoring system and granting the visitor access to the property.

3. The system of claim 2 , comprising:

a camera that is located at the property and that is configured to generate image data,

wherein the monitor control unit is configured to:

receive the image data; and

in response to granting the visitor access to the property, monitor the visitor by analyzing the image data.

4. The system of claim 3 , wherein the monitoring server is configured to:

determine, based on the image data, that the visitor entered an area of the property identified, by a resident of the property, as restricted to the visitor; and

in response to determining that the visitor entered the area of the property identified as restricted to the visitor, transmit, to a computing device of the resident of the property, an alert notification indicating that the visitor entered the area of the property identified as restricted to the visitor.

5. The system of claim 2 , wherein the monitor control unit is configured to:

in response to granting the visitor access to the property, monitor the visitor using a body camera worn by the visitor.

6. The system of claim 5 , wherein the monitoring server is configured to:

determine, based on data received from the body camera worn by the visitor, that the visitor entered an area of the property identified, by a resident of the property, as restricted to the visitor; and

in response to the visitor entering the area of the property identified as restricted to the visitor, generate an alarm event.

7. The system of claim 1 , wherein the monitoring server is configured to:

receive location information that corresponds to locations of the known visitor during a time period before receiving the biometric identifier of the visitor by receiving location information that identifies a path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor.

8. The system of claim 7 , wherein the monitoring server is configured to:

compare the path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor to an expected travel path;

determine that the path traveled by the known visitor deviates from an expected travel path; and

based on determining that the path traveled by the known visitor deviates from the expected travel path, decrease the confidence score that reflects the likelihood that the visitor is authorized to access the property.

9. The system of claim 7 , wherein the monitoring server is configured to:

compare the path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor to an expected travel path;

determine that the path traveled by the known visitor deviates from an expected travel path;

determine that the known visitor deviated from the expected travel path during a time of day when the known visitor is authorized to deviate from the expected travel path; and

based on determining that the known visitor deviated from the expected travel path during the time of day when the visitor is authorized to deviate from the expected travel path, increase the confidence score that reflects the likelihood that the visitor is authorized to access the property.

10. The system of claim 7 , wherein the monitoring server is configured to:

compare the path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor to an expected travel path;

determine that the path traveled by the known visitor corresponds to an expected travel path; and

based on determining that the path traveled by known the visitor corresponds to the expected travel path, increase the confidence score that reflects the likelihood that the visitor is authorized to access the property.

11. A computer-implemented method comprising:

receiving, by a monitoring system that is configured to monitor a property and from a sensor, a biometric identifier of a visitor;

comparing, by the monitoring system, the biometric identifier to a stored biometric identifier of a known visitor;

based on the biometric identifier corresponding to a stored biometric identifier of the known visitor, receiving, by the monitoring system, location information that corresponds to locations of the known visitor during a time period before receiving the biometric identifier of the visitor;

based on biometric identifier corresponding to the stored biometric identifier of the known visitor and the location information of the known visitor during the period of time before receiving the biometric identifier of the visitor, determining, by the monitoring system, a confidence score that reflects a likelihood that the visitor is authorized to access the property;

based on the confidence score that reflects the likelihood that the visitor is authorized to access the property, selecting, by the monitoring system and from among multiple monitoring system actions, a monitoring system action; and

performing the monitoring system action.

12. The method of claim 11 , wherein performing the monitoring system action comprises disarming the monitoring system and granting the visitor access to the property.

13. The method of claim 12 , comprising:

receiving, by the monitoring system and from a camera that is located at the property, the image data; and

in response to granting the visitor access to the property, monitoring, by the monitoring system, the visitor by analyzing the image data.

14. The method of claim 13 , comprising:

based on the image data, determining, by the monitoring system, that the visitor entered an area of the property identified, by a resident of the property, as restricted to the visitor; and

in response to determining that the visitor entered the area of the property identified as restricted to the visitor, transmitting, by the monitoring system and to a computing device of the resident of the property, an alert notification indicating that the visitor entered the area of the property identified as restricted to the visitor.

15. The method of claim 12 , comprising:

in response to granting the visitor access to the property, monitoring, by the monitoring system, the visitor using a body camera worn by the visitor.

16. The method of claim 15 , comprising:

based on data received from the body camera worn by the visitor, determining, by the monitoring system, that the visitor entered an area of the property identified, by a resident of the property, as restricted to the visitor; and

in response to the visitor entering the area of the property identified as restricted to the visitor, generating, by the monitoring system, an alarm event.

17. The method of claim 11 , wherein receiving location information that corresponds to locations of the known visitor during a time period before receiving the biometric identifier of the visitor comprises receiving location information that identifies a path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor.

18. The method of claim 17 , comprising:

comparing, by the monitoring system, the path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor to an expected travel path;

determining, by the monitoring system, that the path traveled by the known visitor deviates from an expected travel path; and

based on determining that the path traveled by the known visitor deviates from the expected travel path, decreasing, by the monitoring system, the confidence score that reflects the likelihood that the visitor is authorized to access the property.

19. The method of claim 17 , comprising:

comparing, by the monitoring system, the path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor to an expected travel path;

determining, by the monitoring system, that the path traveled by the known visitor deviates from an expected travel path;

determining, by the monitoring system, that the known visitor deviated from the expected travel path during a time of day when the known visitor is authorized to deviate from the expected travel path; and

based on determining that the known visitor deviated from the expected travel path during the time of day when the visitor is authorized to deviate from the expected travel path, increasing, by the monitoring system, the confidence score that reflects the likelihood that the visitor is authorized to access the property.

20. The method of claim 17 , comprising:

comparing, by the monitoring system, the path traveled by the known visitor during the time period before receiving the biometric identifier of the known visitor to an expected travel path;

determining, by the monitoring system, that the path traveled by the known visitor corresponds to an expected travel path; and

based on determining that the path traveled by known the visitor corresponds to the expected travel path, increasing, by the monitoring system, the confidence score that reflects the likelihood that the visitor is authorized to access the property.