Number and locations of trials

The required number and locations of trials must first be determined, based on the quantity and source of imported commodities. Information on agricultural imports 

Bananas are chosen for the example below, which is taken from the Import Tolerance Guidelines. 

Approximately 99.8% of all bananas available in theUSA are imported. The highest consumption level for any population sub-group is 0.96% of the diet for infants. Based on information given in the Import Tolerance Guidelines, a minimum of 12 trials would be required. 

The list below indicates the countries and amounts of bananas imported into the USA (thousands of pounds, 1991-95 average)  

Since the USA imports less than 5% of its bananas from Panama or Venezuela, residue trials are not required in these countries. The 12 required residue trials would then be apportioned among the six largest exporters to the USA, listed below  

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