The head of the Personnel Section of the Education Bureau was arrested and the previous signature was invalid. The arrest of the personnel chief of the Education Bureau will affect the validity of the documents issued and the signature on the documents, which depends on different laws and policies. The documents issued are signed in accordance with legal procedures and authorization, so the effectiveness of these documents will not be affected by personnel changes. However, the validity of these documents will be questioned if the personnel chief is found to have violated the rules when issuing documents, such as abusing his power and signing illegal documents. Therefore, the personnel chief of the Education Bureau was arrested, and the previously signed name was invalid. Education bureau refers to the government department or institution responsible for the management and supervision of education affairs. It is a part of the local administrative organization and is responsible for implementing educational policies, planning educational resources and supervising the operation of schools.