a method including providing an initial test sample including a primary material and a relatively smaller amount of at least one adventitious material combining the initial test sample with a standard addition of at least one adventitious material to form a final test sample wherein the standard addition has a known amount of genetically modified adventitious material and analyzing the final test sample to determine the gmo of the primary material and the gmo of the adventitious material application_number US 12860308 A description the results of the pcr test are typically available about 2 days after a sample of an agricultural material is received at the testing laboratory by the time the results are available for a particular shipment of the agricultural material that shipment is well on its way to a final destination e g an ocean port or has already been loaded on a cargo ship for transport to a designated country if the results of the dna screening test such as for example pcr for the shipment fail to comply with the regulations in the designated country the shipment must be offloaded from the cargo ship or diverted to another destination of course this delays the originally planned shipment and increases costs for the supplier of the agricultural commodity therefore to ensure regulatory compliance and effectively characterize the supply chain for a particular agricultural material the supplier must ensure that the pcr test for a particular agricultural material is accurate conventional pcr testing assumes that the sample of agricultural material tested is pure however all shipments of materials of a particular type referred to.