AOAC ISPAM Meeting eBook, March 17 2015

Sampling Plan Update

Current Situation:  Statistically valid sampling plans (e.g., ICMSF) were developed for d f d h ti f “ t i ti if l processe oo s, w ere assump on o con am na on un orm y distributed” is likely to be valid  Published studies and industry testing has demonstrated that field contamination, when it occurs, is most likely to be sporadic, not uniformly distributed, so assumption is invalid  Most sporadic detections in field are inexplicable and non-repeatable

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Sampling Plan Update Current Situation:  Some operations using “Z-pattern”, some using multiple Z-patterns, some using

serpentine, some using directional sampling, some test upon receipt at the processing facility  None are developed to be statistically valid  Currently no statistically valid field sampling protocol  A single “positive” condemns the whole field – no depth of analysis to indicate the degree of field contamination.  Negative test results are meaningless – a future “positive” invalidates the field test results

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