Here's the definition that's on our security deposit page, which doesn't get into the nitty-gritty: Normal wear and tear is a term that Wisconsin law does not define.
(3)Protein Fat-Free Percentage, Protein Fat-Free Content, PFF Percentage, PFF Content or PFF of a product means the meat protein (indigenous to the raw, unprocessed pork cut) content expressed as a percent of the non-fat portion of the finished product.
This directive cancels all other instructions dealing with the 10 or 12 hours duty limitations. III. REASON FOR ISSUANCE This directive combines the duty limitations for red meat and poultry plants into an FSIS directive. Duty limits were previously found in MPI Directive 904.1 and MPI Bulletin 11. IV. REFERENCE FSIS Directive 4610.1, Tours of Duty FSIS Directive 4610.5, Alternative Work Schedules FSIS Directive 5110.1, Reimbursable Services Reference Guide V. POLICY A. Slaughter Line Duty Limitation.