If it’s an Apple device, it’s pretty easy to verify, if you’re not getting into the realm of spycraft. Open the stock recording app from the store and try to record after verifying the preferences allow recording. This is sufficient for catching bad actors who don’t have immense resources behind them. Even easier if it’s a managed device.

If you’re worried about legit espionage, you hold the meeting or do the work in a SCIF, zero devices go in or out period, metal detectors and patdowns on both entry and exit.