So...your mother is the source of information that, not only is this man your biological father, he also "sent a look-a-like in to take his [paternity] test for him"? How could she possibly know that sort of detail? She obviously wasn't present when this happened, so she must have heard it from someone. Who is that someone?My source is my mom. I don't see any reason for her to lie about it after all this time. She has told me much worse things about herself than her possibly sleeping with another man at the time. This particular man was married and is not of means in anyway, so I'm not sure what she would gain by pinning it on him.
Also, how many guys did your mother have sex with around the time you were conceived? Maybe the answer is just the one guy. If that's the case, then she can know for sure that he's your bio father. However, if the answer is anything more than one, then she can't know which of the men is your biological father.
And everyone should be nice to everyone else, but what "should happen" doesn't always happen, and that's especially true in the case of a child born out of wedlock. It's a simple fact of reproductive biology that identifying the mother is easy but identifying the father isn't. Therefore, the consequences of having a kid out of wedlock fall more significantly on women than men, and there's nothing that the law can do to change how human reproduction works.And the "consequences of promiscuity" should fall on both parties-- not just one. And if one, weasels his way out of it, he deserves to pay.
I had more than my fair share of out-of-wedlock sex 30 years ago, so I'm not saying anything bad about your mother. What I am telling you is that, if the story you've told about fraud in connection with the paternity test isn't likely coming from anyone with firsthand knowledge of what happened and therefore isn't likely reliable, so the likelihood that you could prove anything at this stage is practically non-existent (even if the court would entertain this many decades after the fact).