| Barbed Wire
Barbed Wire is an object that can be placed by workmen on the outer walls and fences. It slows down and hurt prisoners who are trying to climb over the walls. The only way for prisoner to not take any damage from barbed wire is by climbing an adjacent tree and jumping from it.
Badly injured prisoners may get unconscious or even die on them. [verification needed]
Escaping prisoners will try to avoid walls and fences with barbed wire and try to get to those without it or look for a better way to escape such as tunneling or destroying jail doors and gates. They also won't try to get over them when guards and snipers are around unless the situation is advantageous (fight or riot nearby, not enough of guards).