1. The anti-drug staff opened the special hair drug detection box for Gao Hua and took out the relevant supporting products.

2. Turn on the camera and write down the identity information. Anti-drug personnel inform suspected drug addicts that according to relevant laws, their hair will be collected and sent to the laboratory for testing to confirm whether they have taken drugs in the near future, and they should cooperate. Otherwise, mandatory testing is required.

3. Prepare new serrated scissors or barber scissors. When collecting hair samples, the staff should wear disposable gloves to collect hair within 3 cm of the hair root end of the back of the head of the suspected drug addict. Hair longer than 3 cm needs to be cut 3 cm from the root end. Divide into two parts, each part is not less than 50 mg. Put two hairs in aluminum foil paper and put them in two clean paper envelopes A and B respectively (aluminum foil paper and envelopes are prepared by anti-drug workers in advance, and several copies are prepared, which are clean and free of foreign objects in person and can be randomly selected by the tested person); The envelope should be filled with sample number, date of extraction and information such as the extractor. Then, the two seals are signed by the extractor and the envelopes are sealed with seals respectively. Fixed photos, attached volumes.

4. It should be noted that different people's hair should be extracted separately, and the residue on the extraction equipment should be cleaned in time during the sampling process, and the equipment should be disinfected to ensure that the samples will not be cross-contaminated. Different people's hair should be packaged independently and numbered uniformly.