This is a terrible situation for you and thanks for your patience while I ponder the situation. It is not cut and dry, as I am sure you know
So, the records weren't stolen from your home but taken as evidence based on a search warrant?
And now your wife's parents have your son and trying to say that you are not a fit parent? What is their basis?
And when you tried to state that the grandparents motivation was because you were trying to get your wife help for her RX problem the court said you did not have the evidence to make the claim of retaliation or to support your claim that your wife had an RX problem.
And also, tell me once more what it is exactly that you want to do - just make sure that your son is in your custody - this is, of course, going to depend on why the grandparents are claiming you are unfit
You will need to produce character witnesses, etc. Do you have any visits wth your son at all now? If yes, then you should have photos of your times together to help show how you and your son have bonded, etc. If you son is in school, daycare (how old is he) you can try to get witnesses or character letters supporting your relationship with your son.