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> someone who had their phone in their hand?

I feel like I have a good idea when someone is recording or not. Phone orientation and behavior is different.

With the macro lens mode on iPhones now, you can take a video of what’s directly in front of you while pointing the camera at a downward angle. There’s no way to tell a person doing that apart from a person who’s texting, other than looking at their screen.

I posted elsewhere in this thread but I think we can still detect this. There is a framing/tracking motion people do when recording that's not present when just texting or using the phone.

> Brain imaging has shown that the brain cells which are activated when a test subject can see that they are being stared at are distinct from the cells activated when the starer's eyes are averted away from the subject by just a few degrees

From Wikipedia[1], but I admit the claim is needing a citation but I feel strongly for the gaze detection argument at least.

[1] https://en.wikipedia.org/wiki/Psychic_staring_effect

Well in this hypothetical scenario, you are stationary (sitting across from each other) so there would be no tracking to notice.

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