以毒攻毒;以賊捉賊

英譯:
set a thief to catch a thief

例句:
The government set a thief to catch a thief, hiring a stockbroker convicted of fraudulent practices to entrap the stockbroker they were investigating for fraud. (政府以毒攻毒,雇用了一名曾因詐欺被判刑的股票經紀人來誘使那位涉嫌詐欺、正受到調查的股票經紀人自投羅網)

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