KOP refers to medication and generally stands for “keep on person.” Some will also define it as “carry on person.” In most prisons, medications that have recreational use or trade value will be distributed a single dose at a time, and in TDCJ these are generally provided at the pill window on the building where one is housed. Prescriptions for medications that have little recreational use or trade value will be issued KOP so it is not necessary to go to the pill window for each dose.