You try them all and one or two of them might decide to tell the truth instead of going to the slammer. That's the best chance of getting the truth....
Yesterday you said such deals where you drop charges in exchange for testimony are not to be believed.
Roll tape....
"I'm not ready to buy this. A prisoner says he heard him banging the wall. What could they possibly promise this prisoner for this little bit of testimony."
That's stunning hypocrisy.