It might seem odd that two inspectors visiting the same site would come to opposite conclusions. However, that is exactly what has been happening in southern California after the Station forest fire. Both inspectors take samples. Inspector A identifies "significant smoke particles," whereas Inspector B finds "carbon < 1%, which is not significant." This article is an attempt to explain how such differences could occur.

Both inspectors performed scientifically respectable tests, yet their results are polar opposites. Conditions after California's Station forest fire were often misleading, but before getting into that we should review a few basic concepts for testing.

The Purpose Should Be Clearly Defined

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