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How does police detect that cash? Do they use specially “tortured” dogs to smell the banknotes (since many of the banknotes probably have traces of coke and other “illegal” drugs)?

From what I’ve read elsewhere, it would be usually some kind of “signal” from competitors or even “partners”, so that the trusted LEOs would go and target the potential prey precisely and those LEOs would, usually, know what and how much to search for?