I used H.T.T Derivan to help me establish paternity of my son since another man was on my son's birth certificate, i already had a dna test done all he had to do was file my case for me since i couldn't pro se since according to csea "peternity had already been established" when the other man signed the birth certificate. H.T. Derivan charged close to 1,600 dollars just to go to court one time and show the judge my paternity test.