Most of the canola grown now days IS genetically modified canola patented by Monsanto. Don't you remember that Canadian farmer who fought Monsanto for years and lost all because his neighboring farmers produced Monsanto's canola and the pollen drifted onto his plants, and cross pollinated, so Mondanto sued him for loss of income as he "stole" their patented seed pollen.
"Genetically modified foods (GM foods, or biotech foods are foods derived from genetically modified organisms"
"Genetically modified foods were first put on the market in 1996. Typically, genetically modified foods are transgenic plant products: soybean, corn, canola, rice, and cotton seed oil."
I'm pretty sure that currently only Monsanto holds patents to genetically modified seeds which are ONLY sold on written contract to large AgriFarms. Those seeds are NOT available to the home gardener. Also according to Monsanto there are only 2 or 3 varieties of GM corn seed available and only 1 sweet corn so far. So you are incorrect is stating most store corn is GM corn - the GM corn is feed corn for animals, now sweet corn for people. Now, if you are absolutely certain of your very generalized statements, please provide some links/documentation.
From a lawsuit filed 03/29/2011..."What makes Monsanto different is its US seed monopoly. Well documented by market authorities, Plaintiffs point out that, “Over 85-90% of all soybeans, corn, cotton, sugar beets and canola grown in the U.S. contains Monsanto’s patented genes.”