Take another test if you cannot believe one test. Just don't then ask yourself if that test is also wrong. :)
Then I'd say you don't have anything to worry about. If you ever need to file for child support, you will have to re-test with a lab certified by the family courts in your area for legally determining paternity, but it sounds good.
Hi, I assume you are talking about a test you buy at the drugstore? Did you get a positive or a negative? If you got a positive, I'd say it was accurate. If you got a negative, I assume you know for sure that the guy did not fake his swab?