There is only one way in which a person could perform a DNA test to see if his wife was unfaithful and that would be if you have a viable DNA sample to test, or “evidence”.

If you suspect that your wife was unfaithful because you found “evidence” in the form of a gentleman’s item, such as an electric razor toothbrush or undergarment or hair, etc., then it would be possible to screen that item to find out if there is DNA on, or in, it that can be tested. If there is a positive hit on an evidence sample you give us, then we could run a profile on that sample against a profile sample from you in the form of a cheek swab. This is called Forensic Infidelity Test.

If you do not have any type of evidence to test, then I am sorry to tell you that unless your wife is pregnant and you have a paternity test, without “evidence” there is really no way to see if your wife has been unfaithful.

My question is if some one is away from his wife for Atleast 1 Year and he go back to his home after 1 year and if he wants to know that his wife did’nt had an external affair or relationship with someone else, can he know this by doing DNA test or how can he know this.

Thanks

Amjad