What does it mean to push an investigation letter from another place?

Investigations by judicial departments from other provinces require letters to other units to request their assistance in the investigation.

It is generally a letter between two departments in different places, or between a superior department and a subordinate department, requesting the other party to assist in the investigation, and there is an official document with a formal reply.

Assisted investigation letters are a type of correspondence in the category of practical documents. Its characteristic is that once it is sent, it must be sent back.

At present, the most common transmission method is fax machine, followed by express mail, and rarely used is email (this method will definitely be widely accepted with the continuous improvement of government affairs electronics and technological level) and applications).

Another way is to inquire by phone, which is a special means in emergency situations. It does not have document protection, but it does have information protection.