In NY (and, I think, California), that's illegal.

I found this out, because at the company at which I worked, managers kept making verbal commitments, then gaslighting me about them. I could never get them to commit in writing, and my own "reflection" emails (the standard advice about this) were worthless. I considered walking around with a little digital recorder in my pocket.

But many states have explicit laws against surreptitious audio recording. I suspect that comes from politicians being caught with wires (yeah, I'm a cynic).

That's why, if you get a surveillance camera that also records audio, they will usually have a card in there that tells you to post notices if you switch on the audio recorder.