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Which method is useful in food testing beverage testing and drug testing? 

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This test represents a major methodological advance in consumer testing of food products in a commercial environment.
Such a development should facilitate rapid quality control testing in the food industry.
Decision makers could employ similar evaluative methods in selecting drug testing materials.
Saliva could make drug testing outside laboratory environments feasible with the appropriate techniques for analysis.
This method can also be extended over a broad level in the testing of food and food beverages in industry.

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