open ended exam question

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One of the exam questions I have asked my first year undergraduate students in “Introductory Food Science and Health” FT4421 was this one:

If you work as a Quality Assurance Manager for a company producing infant foods containing potatoes and carrots, what actions would you take in the case of raw materials coming from Asopos region? Justify your answer using ‘Precaution Principle’.

The students had to address the pollution problem of the river and the water aquifers and the cross-contamination of the food chain with toxic Ni and Cr. Article 7 of EC178/2002 should be used in order to justify the decision to source raw materials from a different region.