Why Arent Lasers Used More For Intrusion Detection?

Why don't you hear more about lasers being used for intrusion detection? It seems like they can provide pretty accurate feedback on a person's location, not just that they've crossed into a certain zone. Paired with PTZs it seems like they could be a pretty good solution for some deployments. Is it a power issue? Cost? Or is it just not the most popular technology? Are customers not asking about them? All of those?

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