We need realistic thresholds. The maximum separation distances are no greater than 50m. Seeds remain viable for 5 years at least.
Forage maize has potential issues for sweetcorn - but there are barriers.
NIAB reported on separation distances. National Listing is very special. Never zero, there is always a level of impurity. Although more tests were requested from those who had conducted the Flavr Savr study, none were carried out. In fact the test animals had developed stomach lesions which should have been investigated further.