What does it mean that there was no activity on the main floor of the Watts home between 01:48 and 04:23? It means no one was on the main floor during that interval. Right?

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When Shan’ann opened the door to her home at 01:48, did she set off the exterior sensor or the interior motion sensors? Remember she entered, kicked off her shoes, moved to the the bottom of the staircase and apparently left her suitcase there. Her purse was also found on the kitchen island. When did it get there?

When a house is armed, setting off motion sensors sets off an alarm, something she wouldn’t want to do – it would awaken the children [assuming they were still alive], and her husband, not to mention the whole neighborhood.

There is a way to set the exterior alarms while having the motion sensors inside disabled – so they don’t go off alerting to the people who live there. There’s also a way to disarm all the sensors so none of them go off. Exterior alarms will nevertheless send alerts to let the user know which doors or windows are open.

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The system also cannot arm until these exterior sensors that are alerting have been closed/locked.

Remember, motion sensors are designed to alert to people breaking in and moving inside when the people who live there aren’t home. That’s when the alarm is set to Armed Away.

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how to not set off your motion detector

What does it mean that there was no activity on the main floor of the Watts home between 01:48 and 04:23? Does it mean no one was on the main floor during that interval, or does it mean it was disarmed while the crime and cover-up was being committed?

If you wanted to commit murder in your home, and it was premeditated, would you do it with the motion sensors enabled or disabled? Would you commit a premeditated murder while your home security system was activated?

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From Vivint blog:

Weekday mornings can be rough sometimes—preparing for the day, getting the kids ready for school, hurrying out the door to beat rush-hour traffic—and it is easy to forget that you armed your system the night before. Before you leave for the day, make sure to check the color of the home button on your panel to see if you need to stop and disarm your system. Here’s what each color on the panel means:

Red light: When your system is armed, the home button on your panel will turn red. There are two different arming types:

  • Away: Every sensor in your home, including motion detectors will be activated. Any movement or opening doors and windows will trigger an alarm.
  • Stay: All sensors are activated except for motion detectors or interior doors. This allows you to move freely around your home but will trigger an alarm if any exterior doors, windows, or glass break sensors are triggered.

Green light: If the home button on your panel is green, your system is disarmed. You are able to leave your home without triggering an alarm, and your system is ready to arm.

More: Getting to know the Watts Home as a Crime Scene: #1 Original Floor Plans #2 Upstairs Landing, #3 The Balcony, #4 Revisiting the Windows