Security personnel at airports, as well as clinical observers, may experience a steady decline in accuracy as a result of fatigue or of a gradual unintentional change in standards used when an observation continues for a long period of time. this is known specifically as observer:

The term used to explain this phenomenon is observer drift.

Observer drift is a commonly encountered problem in conditions where individuals have to continuously make observations for a long period of time – be it for work purposes or research purposes. Some downfalls from this phenomenon is of course the possibility of error, be it when it happens on work or research environments.

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reducing the scale of the market for a new product.