Serbian term (edited): pravilo nesudaranja čisto-prljavo

Use disposable clothing in the isolation areas, clear labelling of dangerous items and wastes, and manage to separate clean and dirty paths.
http://www.eaeve.org/fileadmin/downloads/executive_summaries...

New Food Hygiene Legislation - applying from 1 January 2006
CLEAN AND DIRTY SEPARATION
7. Reg 853/2004, Annex III, Section I, Ch.lI, 2 (red meat) and Section II, Ch.lI, 2 (poultry meat) require slaughterhouses to ensure the separation in space or time of various stages between slaughter and dispatch of meat.
http://www.pdfio.com/k-7564964.html

The concept of clean and dirty separation (Chapter 1, see the section on Design of a decontamination area) does not only apply to the instruments themselves but also the transport aids such as containers and trolleys.
http://books.google.rs/books?id=258OvWuwF6wC&pg=PA167&lpg=PA...