During one of my first experiences being audited while working in the food manufacturing world I was asked by the auditor “Is your sanitation program controlling pathogens during the entire production run?”. I immediately responded with a boastful yes! The auditor of course followed up with “Please prove it.” Being relatively new, I temporarily froze as I knew our product results never yielded a positive in my time there but, was fairly certain that was not sufficient proof. Thankfully, I received a quick education as my supervisor presented the auditor with our environmental monitoring results which included pre-operational, operational, and post operational time points. Each sampling time verified something slightly different and was evidence our sanitation program did indeed control pathogens through the entirety of our production runs. The key take-away for me was that an environmental monitoring program must take into consideration when to sample and what each sampling time’s results mean within your Food Safety System.