DNA sample collectors are non-interested third party persons. This means that they have no interest in the outcome of the test. For this reason samples cannot be collected by friends, family members, co-workers etc. Legal DNA sample collections should be performed at a clinic or by a mobile collector who is trained in proper DNA sample handling.
While wearing gloves the DNA sample collector will remove one sterile swab from it's wrapper. The DNA collector will then rub the swab on the inside cheek of the donor for more than 30 seconds. The DNA collector is removing skin from the inside of the donor's mouth. Your skin contains DNA. Your skin naturally sheds and regrows very quickly. The collector is collecting the skin that you would naturally shed. This is not a saliva test.
After completing the process with the first swab the collector places the swab into the previously labeled envelope. The DNA collector repeats the process until two or more swabs are collected.
The DNA collector repeats the process for each person being tested.