Federal Prison Industries a Matter of Double Dipping

In the Federal Prison Industries, Inc. Annual Financial Statements Fiscal Year 2012 has delivered the 2012 statement.  The mission is defined as, "to protect society and reduce crime by preparing inmates for successful reentry through job training". This programs gives the inmate skills training and work experiences to about 13,000 inmates.  The reports states that keeping them occupied with productivity reduces operating costs and 24% are less like to return to a life of crime.  My question is what costs are lowered, less lighting, less staff, less food?  The FPI funds this operation with the sale of goods which according to the report has been challenged by the economic times and increased competition for government business and a reduction in discretionary spending.

In 2012 the FPI operated 6 business segments: (1) Clothing and Textile; (2) Electronics; (3) Fleet and Industrial Products; (4) Office Furniture; (5) Recycling; (6) Services. The majority of revenues are derived from the sale of products and services to other federal departments agencies and bureaus.  I wonder if the those agencies have a line item for costs if they are in essence buying their own products?