Depends on the size of county. Cook County Jail in Chicago is huge. My county jail, before ti was shut down had about four cells in it. These days, prisoners in my county are housed at a neighboring county's jail system.

A forensic psychological exam is done by a psychologist appointed by the court to determine if somebody understands what it means to go to court. If they don't, they are sent to State Mental hospitals without a trial, until their condition is considered improved enough to understand the legal procedures. If they don't improve, they might never actually go to trial but stay at the State Mental Hospital in a lock down unit, usually.

Laurie