This kind of thing exists and is rife with head office pushing iffy practices to boost the detection - e.g. sampling a bigger area than the official measurement

This kind of thing exists and is rife with head office pushing iffy practices to boost the detection - e.g. sampling a bigger area than the official measurement equation requires etc. Lots of problems with ‘meth detection’ companies that over-detect then sell you tens of thousands of dollars of remediation services.