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it isn't illegal to carry cash on you... just so you know

but there are almost no legal reasons to have $500,000 in undocumented cash on you, I can't think of any. It might be reasonable given the preponderance of evidence on the scene to suspect that the money was stolen or drug money, if someone stole $500,000 in proceeds from your church poker night wouldn't you want the police to seize it from the thief if they stopped him?