I don't see why it would be a big deal to talk about it in a restaurant. Unless the person he was watching was there (in which case I'd argue he's not a very good PI anyway), as long as he doesn't get specific with names and locations there's not really any negative consequences. Sure, the people around him know his profession, but it's not like that's going to have anybearing on his current investigation.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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