Why cant you chew gum during the cheek swab for paternity?

Chewing Gum during a cheek swab for paternity testing can contaminate the sample and affect the accuracy of the DNA analysis. The gum may leave residues in the mouth that can mix with the cells collected, potentially leading to misleading results. To ensure a clean and uncontaminated sample, it's important to refrain from eating, drinking, or chewing gum before the swab.