What does the police station collect dna for?

Legal analysis: It's just routine information collection, which is entered into the information base to prepare for the detection of the case. Please consult the police station for details. DNA sample collection method: It is generally recommended to select routine samples: blood stains, oral swabs and hair. Sampling method of blood stains: Blood stains can be taken from ear edge blood or finger blood, and the baby can be heel blood. 1. To collect blood at home, you need to prepare alcohol cotton balls, blood collection needles, medical sterile gauze and paper envelopes in advance. 2. Sterilize the blood collection site with alcohol cotton ball, puncture the blood collection needle, squeeze out 5 drops of blood the size of soybean grain, press it on the medical gauze, dry it in the shade naturally and put it into the envelope. Sampling method of oral swab: 1. Rinse your mouth with clear water to ensure that there is no food residue in your mouth. 2. Use a medical cotton swab, put it in your mouth, and wipe it repeatedly on the cheek inside your mouth for 30 times. 3. Take out the cotton swab and put it in a clean place to dry in the shade; Collect at least three cotton swabs in the same way. Hair sample sampling method: wash your hands; Grasp the place about 4 cm away from the hair root by hand and pull out 5 hairs (clear hair follicles can be seen at the end of the hair).

Legal basis: Criminal Procedure Law of People's Republic of China (PRC).

Article 130 When conducting an inquest or inspection, investigators must hold the certification documents of the people's procuratorate or the public security organ.

Article 132 In order to determine certain characteristics, injuries or physiological conditions of victims and criminal suspects, people can be examined, fingerprint information can be extracted, and biological samples such as blood and urine can be collected. If the criminal suspect refuses to check, the investigators may force the inspection when they think it necessary. Physical examination of women should be conducted by female staff or doctors.

Article 199 of the Criminal Procedure Law of the People's Procuratorate: In order to determine certain characteristics, injuries or physiological conditions of victims and criminal suspects, the people's procuratorate may conduct personal examination, extract fingerprint information and collect biological samples such as blood and urine. When necessary, a forensic doctor or doctor may be appointed or hired for personal examination. The collection of biological samples such as blood should be carried out by doctors. If the criminal suspect refuses to check, the prosecutor may, when he deems it necessary, force the check. Physical examination of women should be conducted by female staff or doctors. Personal examination shall not use methods that damage the life and health of the inspected person or degrade his reputation and personality. Procurators shall keep confidential the personal privacy of the person under inspection.