Most people think the "temptation investigation" in modern Chinese is said "entrapment" in the USA and UK criminal law. American and British have a positive attitude to the "temptation investigation of opportunity". This method has become edge tool they deal with "Criminal cases of no specific victim". But after thorough investigation it is found that the "entrapment" is just a legal defense of the defendant in the US and UK criminal law, it is not a separate investigation.