An update on teens from past seasons.

Boston teens visit a prison in Suffolk County, Mass.

A teenage girl visits a prison in Suffolk, Va., where her cousin is an inmate.

A troubled teen who hopes to become a rapper visits a prison in Portsmouth, Va.

A troubled teen visits a prison in Floyd County, Ga.

A spoiled teenage girl visits a prison in Oklahoma County, Okla.

Three troubled teens visit a prison in Oneida County, N.Y.

Three defiant girls spend the night in a prison in Richland County, S.C.

Troubled teens act out while visiting a prison in Virginia.

Troubled teens clean toilets and are interrogated by a judge during a visit to a Georgia prison.

Teens visit a prison in Lake County, Fla., where one of the girls runs into a member of her family.

Four teens are terrorized by prison inmates during a visit to an Oklahoma City jail.

A gun goes off while four teen boys visit a prison near the Jersey Shore.

Troubled teens take lie-detector tests during a visit to the St. Clair County Jail in Belleville, Ill.

Four at-risk teens visit a prison in Jacksonville.

In the third-season opener, four rebellious teen girls spend a day in a Boston prison.