US Prisons, October 2015:

Finally, the government has decided to eliminate pork — from the menu in federal prisons... The Bureau of Prisons, which is responsible for running 122 federal penitentiaries and feeding their inmates three meals a day, said the decision was based on a survey of prisoners' food preferences: They just don't like the taste of pork.

Another take:

A woman whose son is in federal prison in Fort Worth says he has complained about the lack of pork, saying he had heard it was because of complaints from Muslim inmates.

UK Prisons, May 2012:

Non-believers avoided confrontation with any Muslim in case it led to retribution from the wider group, and said they even avoided cooking pork or bacon in communal kitchens or undressing in the showers in case it caused offence.

Do federal inmates not like pork? Or are they just saving their bacon?