Psychological/behavioural.

The Washington Post had an interesting piece on this (can't link. Worth searching). The argument is that people tend to take justice in their own hands. For good reasons possibility since police department will usually not be useful, but there's a significant potential for tension if you confront the person that you think has taken whatever was tagged. Something which is strongly discouraged (you'd be supposed to contact law enforcement telling them that you've located stolen goods).

Notice that these devices are marketed as tools to find what you've lost. Never as anti theft devices.

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