Is There a Methodology to Prosecution of a Captured Person?

There's no methodology in place, no policy that america or the uk, or european countries can put on people who've been captured. So syria wants to give them back northeast syria. But curds that hold these prisoners want to send them back to their home countries,. but the home countries are refusing. And every country is finding it hard to take battlefield evidence if they can even get hold of it. Some women have been prosecuted just as wives, in home makers that lived in isis territory. The local engios have made some rehabilitation efforts. They're very crowded in the kurdish prisons and the conditions are bad - but the human treatment is spectful