Are the security inspectors in Jiecheng Ye Sheng reliable?

Not reliable. Most of the information about recruiting security inspectors posted on the Internet is released by intermediaries, basically to cheat the intermediary fees. If you want to be a security inspector, you'd better pay attention to the recruitment information published in official website. Security inspector is a profession announced by Ministry of Human Resources and Social Security, which is engaged in security inspection in airports, stations, docks and other public places.