What's the difference between a criminal policeman and a detective?

Criminal police (hereinafter referred to as criminal police), do criminal investigation, analyze and study criminal cases; Organize and coordinate the detection of general, major and extraordinarily serious criminal cases; To undertake the extraction, inspection and appraisal of case traces and material evidence. To undertake anti-drug, anti-gang and anti-terrorism work within its jurisdiction; To undertake the investigation and prevention of economic crimes within its jurisdiction; To undertake liaison and contact with foreign-related criminal cases and foreign-related police affairs. In a narrow sense, "criminal police" refers to the police of the criminal police team. Broadly speaking, it also includes economic investigation teams and so on. The main task is to investigate criminal cases, such as theft, murder, fraud and trafficking in women and children. At present, the so-called detective refers to the person who accepts money and other property from the employer and investigates and takes photos for the employer. Through secret investigations, etc. , so as not to be perceived by the respondent. In the past, the so-called detective meant to help the police investigate and solve the case, provide evidence to help people or someone investigate and help the police solve the case, and keep it secret as required, but it costs money.