How to tell a fake homeless person from a real one?

I really want to try panhandling because I heard I can make more money panhandling than doing jobs at my skill level. So I need to know so I can really make it convincing.
Update: Also just so you know I only live an hour away from Manhattan so that is where I will be doing my panhandling. Just a $20 round trip would be worth the potential payoff.
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