Is it true that foreign prisons allow you to fight against another prisoner?

Answer 1

Foreign eh?   Name a couple of foreign countries and we will try to help. 

Answer 2

Prisons in some nations really only guard the perimeter and it's a free for all inside the walls, strongest survive. When guards do have to enter they don't mess around and will kill with little provocation. 

Answer 3

Technically, yes. They allow inmates to beat each other.