I am an inmate in a U.S.

Answer

If in prison there is no halaal food available, then the inmate may consume 'kosher' products. However, we still advise that he should abstain from meat products even if marked 'kosher' or even if certified 'halaal' by a Muslim organization. All these halaal certifiers of meat products are bogus and frauds. They certify even haraam meat in exchange for monetary payment.