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>make sure you get him on that, record with your cell phone - hidden - or something

Be incredibly careful: this could be a violation of state privacy/wiretapping laws.

Yes, what you need to check is whether your country/state requires one party, or two- (all-) parties consent. See this: https://en.wikipedia.org/wiki/Telephone_recording_laws

I don't mean telephone necessarily, but 'live' recording

Not sure what's the laws on that, but yes, it's better to check