Theirs alot to look for. The first things I focus on are flaking, typology, material and quality. Lots of flint is easily faked these days. The knappers are getting better and the technics are more sophisticated.
I don't know who Robert Melton is, and I never said he tried to sell me fakes.
I posted on another site a photo of a bunch of fake arrowheads that two women in Hewitt,Texas tried to sell me. I don't know who made them, maybe someone else knows more about these women being associated with a certain knapper, but I was just posting a warning about the two women selling fake arrowheads.