Monsanto does not allege no testing. They do no “whole food” testing, which would be stupid and expensive. They do protein testing.
Bacillus Thuringiensis itself has been repeatedly tested over the past 50 years in humans and animals and is approved for use in Organic farming.
http://pmep.cce.cornell.edu/profiles/extoxnet/24d-captan/bt-ext.html
Again, it’s the amount of Bt present that’s in question. It’s a volume/surface area calculation. The organic farmer applies the Bt to the surface of the plant. And only parts of that. The GMO puts Bt in every single cell of the plant.
If the solution to pollution is dilution what about testing for the relevant levels of Bt found in the GMO corn vs those found in the Organic corn?