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You could always test it out and mention something false that the person supposedly said. Like "when you said you dip your tomato plants in ice water just before transplanting, how long do you do it?". If he answer with "ten seconds" or basicly anything but "I never said anything about it" - you may have nabbed a cop.
Other test questions include, "did you call your sister about those things we talked about?" (assuming he doesn't have a sister). Any answer but "what sister??" would be an indicator you aren't chatting with the real person.
Is it really worth the risk? I wouldn't go near him at all or associate with him in any way. Most cops wont go through all that trouble unless they think there is someone bigger involved and then you could get caught up even if there really wasn't....