Legal analysis: handprint identification: 1. Understand the situation of handprints submitted for inspection; Second, test the fingerprint of the sample; Third, make pictures; Fourth, fingerprint identification procedures; Five, inspection and analysis of fingerprints; Sixth, comparison.

Handwriting identification: Handwriting identification is a special technology to identify the writer according to the characteristics of people's writing skills and habits and their reflection in writing and painting. The main task is to prove whether the handwriting on the documentary evidence is the handwriting of the same person and whether the handwriting on the documentary evidence is the handwriting of a suspect through the same identification test of handwriting. Handwriting identification can not only test normal handwriting, but also test handwriting with changing writing conditions (including writing posture, writing tools, padding, etc.), intentionally disguising handwriting (including left-handed handwriting and ruler-drawn handwriting), imitating handwriting and painting handwriting. When the same person writes with the same pen, the characteristics of pen marks can also be used to enrich the basis for identifying the writer.

Legal basis: General Rules of Judicial Appraisal Procedure

Article 14 A judicial appraisal institution shall examine the entrusted appraisal items and appraisal materials. Those who belong to the business scope of judicial authentication of this institution, whose authentication purposes are legal and the authentication materials provided can meet the needs of authentication shall be accepted. If the appraisal materials are incomplete and insufficient and cannot meet the needs of appraisal, the judicial appraisal institution may ask the client to supplement them; If it can meet the needs of identification after being supplemented, it shall be accepted.

article 28 a judicial authentication institution shall complete the authentication within 3 working days from the effective date of the power of attorney for judicial authentication. If the identification matters involve complex, difficult and special technical problems or the identification process takes a long time, the time limit for completing the identification may be extended with the approval of the person in charge of the institution, and the extension time limit shall generally not exceed 3 working days. If the time limit for appraisal is extended, the client shall be informed in time. Where there is another agreement between the judicial authentication institution and the client on the time limit for authentication, such agreement shall prevail. The time required to supplement or re-extract the identification materials in the identification process is not included in the identification time limit.