It’s always best to assume you’re being watched.
The reasons are obvious. The means are abundant and cheap.
Some systems can be defeated. Countermeasures can be blunt or even elegant.
I didn’t test the resilience of this perimter in the Hollywood Hills. However, I think a steak bone might have been the solution.
About the author: I am Stephen Kennedy, an experienced photographer with more than 2500 completed sessions in all 50 US states.