The notarys responsibility in carrying out his/her position relating to the principle of prudence in terms of identifying service users who commit criminal acts of document forgery is very important. The notary must first recognize the identity of the confronter by examining and paying attention to the original documents shown by the confronter. One of the documents is the Identity Card (KTP), or other documents that constitute formal identity.In relation to criminal offenses, notaries must be more careful in carrying out their positions, especially in recognizing service users. If the confronters have fulfilled all the formal requirements, these requirements are sufficient as a basis for the Notary to perform the legal actions desired by the confronters. Notaries are not burdened to seek material truth. However, when there are doubts about the documents required for the deed, the notary should seek the material truth of the documents. If there are doubts and errors in the documents brought by the confronters, the Notary should refuse to make an authentic deed, to achieve the principle of prudence in recognizing the confronters and to avoid disputes in the future.