Seventeen-year-old Nick Bollea is now sharing living space with three other juvenile inmates.
He initially was segregated because he is a minor, albeit convicted in adult court. A judge denied a transfer request from his lawyers on Tuesday.
Pinellas County Sheriff's Office spokeswoman Cecilia Barreda says housing assignments are routinely reviewed because the jail's population constantly changes. That created an opportunity to house juveniles together.
Bollea is serving an eight-month sentence after pleading no contest to causing a crash that seriously injured his friend.
