What do you mean by external investigation and promotion?

It refers to people with criminal records pushed by big data of public security organs, including pornography, gambling and drugs, cults, etc.

When there are foreign prisoners, local public security personnel are sent, and foreign public security personnel are sent to assist in the investigation.

"Public security" is generally called "people's public security" (English: People Public security), and the police generally called "public security" in China refers to the people's police of public security organs. "Public security police" is the people's police who safeguard the security of the country and citizens, and is referred to as "public security police" for short. The basic functions of public security organs are dictatorship and democracy, which embodies the requirements of public security organs as tools of people's democratic dictatorship.