Could a poor method of collecting oral epithelial cells with the swab affect the test results?

Thank you for your continued support.
Thank you for informing us of the test results.
May I ask you one question?

The result came out showing a parent-child relationship of 0%,
but could our poor method of collecting the oral epithelial cells with the swab
have affected the test results?
For example, rubbing too hard, or not drying it sufficiently.

I would be grateful if you could advise me.
Thank you in advance.

Thank you very much for using our testing service on this occasion.

If this test has been of even a little help to you, all of us here are truly delighted.

Regarding your inquiry,
for both of the test subjects' samples (the alleged father and the child),
we confirmed that a sufficient amount of DNA was obtained before reporting the test results.

Therefore, please rest assured that your sample collection method
has in no way affected the test results.

We wish you continued good health and happiness in the future.