For those thinking about general home safety in the wake of this, the following may have specifically helped in this case:
1. Sliding glass doors at any level of the home should have wood or metal placed in the interior slats so that they cannot be opened from the outside without breaking glass
2. Internal windows that open laterally should also have wood or metal in the internal slats to prevent lock picking and opening
3. Windows and doors that open should have alarm sensors that trigger when the alarm is on and when the window or door is opened
4. Windows that do not open should have “glass breaking” or vibration alarms
5. Areas typically unused or vulnerable should have motion sensing alarms once the alarm system is set to away
6. All alarms should link to a centralized system that creates a siren when triggered, and that can be turned off both with a normal code or with an emergency code that still leaves the alarm active but silent. The alarm, when not turned off in normal mode, should correspond to a center that brings law enforcement out after a certain amount of time
7. Exterior of the house should have floodlights and cameras, or cameras with infrared detection, that record to an offsite server or service (Arlo, Nest, etc.) so that people casing the house can be detected and so that video evidence of a crime can be gathered, or cameras can be checked in real time linked to an app. The app can create push notifications on a phone with noise.
8. Anything suspicious should be communicated to a trusted friend or to law enforcement, asking specifically for a report, to create paper trails
9. Interior doors should be locked or barricaded if possible when sleeping. If there are multiple dependent people in a home such as a loved one in a different room, interior doors may be left open if there is diligence in the alarm system
10. Any threats should not be actively investigated in the house, but rather a person should adopt a defensive position if there is an issue that needs to be observed or help needs to be called
11. All of the above should work together to provide 5-10 seconds of time or alertness to activate a defensive plan, or to access a defensive item as may be needed
If a coded door is used, the code should be changed frequently and who has access should be documented.
Any and all firearms or defensive items should generally be locked and inaccessible unless under your direct control.
Hope this helps someone out there.