MPS turns to greenhouses for food security, inmate rehabilitation This article was originally published on Malawi24 ">Malawi24 , Malawi's #1 independent news platform. The Malawi Prisons Service (MPS) has adopted greenhouse farming to improve food security and inmate rehabilitation with Kachere Female Prison producing vegetables year-round despite limited space. Steve Meke, the service’s publicist said that the technique has proven to be valuable especially in urban prisons where land is scarce.