Police officers also rely on the help of a broad range of complementary experts: psychologists, lawyers, community workers, public health officers, and so on. That spirit of cooperation is just as vital when it comes to protecting economic integrity. No one policing agency can fight alone against terrorist financing, money laundering, counterfeiting, or financial market fraud.
This has become especially true in recent years, because of the growing sophistication of financial instruments and trading technologies. It's now much easier to hide one's own identity, or to steal someone else's, using Internet and other anonymous networks. And it's easier to confuse people with ever more complex financial schemes.