One of our clients at $Job is a testing laboratory for mold & asbestos samples - just from building inspectors & such. To maintain their modest accreditations, every single Analyst (person looking at submitted samples through a microscope) at that lab has to perform daily duplicates & replicates of their own & their coworkers' results (and achieve fairly demanding levels of consistency on those). Then they trade samples with other labs weekly or monthly, to demonstrate further consistency & accuracy of results. Then the accrediting inspectors come through to inspect regularly. Then...
Where the hell were the grown-ups, let alone an inspector who actually understood laboratory QC, when the FBI was running a Keystone Cops clown lab for years?