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Welcome to Just Answer. A DNA swab collects your cells from the inside of your cheek. The cells collected are used to identify your DNA. There is no way that anyone can change their DNA, so no way to beat a DNA test. Your DNA can then be compared with cells from another individual.
Please let me know if you have other questions about this.
I'm afraid it is incorrect. There is absolutely nothing that will "change" your DNA. You were born with it (it's a gift from both your parents), and you will die with it.
You can read all sorts of flapdoodle online. Half-truths are twisted to "prove" whatever it is that someone wants you to believe. There is also a lot of misunderstanding about genetics and the subfield of epigenetics. There are things that can change how a gene is expressed, however, it doesn't modify the sequence of the DNA helix. Therefore, the short answer to your question is you can't change your DNA to beat a swab test.