Who verifies the product depends on who the Certifier is.
I am active with MOFGA, they originated Certified Organic in 1970. Most organic farms in my area [Maine] use MOFGA. Recently the USDA got into certifying organics [led by a Monsanto exec]. So now it really depends on who the regional certifier is that USDA entrusts to do the certifying.
My wife recently retired from working in a grocery store where she was the Produce Manager. Her surveys documented that on average fresh produce costs 15% more when it is Certified Organic.
I appreciate the intro to MOFGA, and a quick review shows a sincere and quite comprehensive program for guidelines to insure long term healthy protection of farming and the environment. ... and I especially trust the farmers of Maine.
...Still. intentions and profit don't always go hand in hand. Production is based on doing what's best for the optimum crop. The bottom line for profit is a result of the least cost for the greatest production. Rebuilding soil through a natural process is much more expensive than using proven growth and pesticide chemicals. The extra cost of organic is supposed to be because of the extra cost to produce... including the probable lower level of productivity.
The question remains... Specifics for the verification process.
The road to h''' is paved with good intentions.