Certainly one of the major problems we see with this question of health risks is the fact that there is no post-market surveillance. Health Canada set up a post-market surveillance project and hosted an international conference and then abandoned that project of tracing and monitoring GE foods in the food system, which is what you would do for population health studies or public health studies generally. And of course mandatory labelling would be necessary.
On December 16th, 2010. See this statement in context.