hey, good question. tbh it really depends on what kinda 'suspicious' you mean by that. for basic stuff, they're actually pretty decent these days, but it's not like sci-fi movie level detection.
for anything simple and repetitive, like:
* **loitering:** someone hanging out too long in a specific zone after hours.
* **object removal/left behind:** an item suddenly appearing or disappearing in an area it shouldn't.
* **unauthorized access:** someone going into a restricted area or jumping a fence.
* **crowd anomalies:** unusually large gatherings or rapid dispersal.
they can flag that stuff pretty well. a lot of systems can filter out animals, rain, leaves, etc., better than older motion detectors too.
where they still kinda struggle is with:
* **nuance and intent:** is someone just fidgeting or trying to pick a lock? they can see the action, but understanding *why* is still hard.
* **false positives:** still happen, especially with weird lighting or shadows that look like a person.
* **complex human interactions:** two people arguing vs. just talking animatedly. the AI might flag both as an 'altercation' potentially.
* **privacy concerns:** obviously, face recognition and tracking people everywhere raises a lot of red flags, even if the tech is there.
so yeah, 'good enough' depends on your use case. for basic, predefined behaviors, absolutely. for predicting complex human actions or mind-reading, not quite. they're amazing tools to help human operators, but not a replacement... yet.
