So, what's the difference between a prisoner and a hire-worker?
Nothing!!!

TOKYO (AP) - Need workers? Japan's penal system has the answer: prison labour.
The Justice Ministry began advertising its captive labour supply on its website this year in hopes of getting more company work orders as the prison population rises. The advertisement, started in March, praises the benefits of labour in prison, outlines the types of products available and provides links and phone numbers for companies to call.
............. Shotaro Watanabe, an office at the Correction Bureau, said prison factories were also having troubles because the inmate population is aging and workers there are not as productive as they used to be.