Bummer to hear what happened to your friends, but glad they are doing better now. There are scum everywhere, and there is no way of flushing all the stuff down the drain.
There are a great deal that can be gotten for home security now. They range from motion detectors, to sound detectors. These can be paired up with many app's etc.

Being prior military, I am ALWAYS on high alert. Best to keep y powder dry, and a steady finger on the trigger.

Thank you,

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Henry