That is why the US Drug Enforcement Agency (DEA) stations agents in every major producer and transshipment country. The DEA also offers generous rewards to buck up the morale of cooperating local police as well as to reduce incentives for collusion between police and criminals.
譬如美國緝毒局不僅在全球重要毒窟及毒品轉運國駐有探員協助緝毒，更提供優厚的獎金，提昇當地警方的緝毒士氣，同時減少警匪勾結的誘因。