Connie, what am I suppose to do? ---I think one of my colleagues is in a relationship with an offender

Many custodial facilities have implemented anti-fraternization policies that regulate contact between staff and inmates. These policies either limit, or altogether prohibit, interactions between employees and current or former inmates and their families. Offenders cannot consent to any relationship behind the wall so this violation will end in termination and possibly jail time, depending on the details. If you are aware of any such relationship you have an obligation to come forward and report it. You never know, you may be doing your colleague a favor.