I was sent to prison and my kid’s mom signed over her rights to our kids and I was wondering since we had shared custody if I still have my rights and can go get them from another state?
You say “signed over her rights.” And then you ask if you can get your rights back from another state. First of all, if you were not married to the mother of your kids when they were born, you will only have rights if you went through the Courts to establish paternity. Simply signing papers at the hospital or being on the birth certificate are not enough to give a father any rights in Arkansas.
It is possible that you might have been legally declared the father if the mom put the kids on ArKids and the state then went after you to get some support for the kids. Should that have happened, it does not establish custody or visitation, so you would still have to go through the Courts to get the legal order allowing you to see your kids.
If she completed an adoption there is very little, if anything, that can be done regardless of state. You need to consult an attorney that practices is family law to find out what can be done in your situation.