The principle of substantial equivalence has been used for risk assessment of the GE crops commercialized so far (Kier & Petrick, 2008; Ko ̈nig et al., 2004) and the results support the fact that these crops are equivalent to their non- transgenic counterparts.
Concerns have been expressed about the efficacy of the method for detecting unintended effects. Field compari- sons in multiple locations have been recommended in order to minimize the differences due to the environmental effects and large data collections have been created