What is the dispatched judicial police?

Dispatch judicial police? That's not an official police officer.

They should be assistant police officers (that is, contract workers or temporary workers) recruited by a human resources company entrusted by the judicial authorities. The personnel relationship is with the human resources company, and then they are dispatched to the procuratorate or court to assist the official judicial police in their work. Wages are also allocated by the judicial authorities to the manpower company, and then distributed by the company (the company charges a certain management fee).