Which hand and finger should I use to press the fingerprint?

Legal analysis: there is no clear rule about which finger to use to press the fingerprint. In life practice, fingerprints are usually pressed with the right index finger. This is the traditional way of signing contracts in China since ancient times. Because in the 1950 s, especially before the end of the Qing Dynasty, the illiteracy rate in China was very high, and most people could not read and write; Therefore, when signing relevant contracts or other legal documents, it is often to find someone who can read and write to draw up legal documents, and then the parties will sign them (draw a text or figure according to their own understanding), and the parties will confirm the signing of legal documents by their handprints. In fact, it was very difficult and inaccurate to identify and compare fingerprints in ancient times, but people at that time were introverted (or superstitious and afraid of punishment from heaven), and there were often many witnesses to the related operations. Therefore, they generally dare not deny their fingerprints. In order to ensure the authenticity of this handprint and facilitate comparison and verification, the right thumb is generally used to press the handprint; Its initial motivation comes from the fact that the right hand is the main functional hand (relative to the left hand), and the second is that the right thumb accounts for about 40% of the total function of the hand (in disability identification, if the right thumb is missing, it is regarded as the right hand function loss of about 40%), which can be described as the king of fingers. Since then, the right thumb has been widely used for handprints, which provides the best guarantee for finding comparative samples (previous handprints) in future disputes, thus increasingly strengthening the operation mode of signing legal documents with the right thumb.

Legal basis: Article 53 of the Constitution of People's Republic of China (PRC). People's Republic of China (PRC) citizens must abide by the Constitution and laws, keep state secrets, cherish public property, observe labor discipline, observe public order and respect social morality.