Article don't tell you much, does it ?
We had an organic grower at our farmers market last year. I visited with her a little. I asked how she could be organic when her garden was surrounded by conventional corn & soybean fields. She said there only had to be like a 30 foot barrier between the two areas. Come on now, anybody knows sprays & pollen will drift farther than that.
If a person wants to believe in organic, fine, but it doesn't mean a whole lot.
A friend wanted to buy organic seed oats, so he could raise organic oats. They were out of seed, so the certification deal made a decision to let them use ordinary seed. So now oats starting not as organic is going to go as organic & be fed to whatever, then sold as organic meat or eggs.
How can you be sure ? Your guess is as good as any!!
Most small growers who sell at farmers markets aren't going to go to all the trouble and expense of getting certified organic. The best thing to do is talk to them about their growing practices and decide if how they're growing things fits close enough to what's important to you.
That's exactly how we do it. We have a 300 ft, minimum buffer strip around our market garden. We do use fertilizer, plants need it to grow! Also some chemical weed stuff. If people ask, we explain how & why. We only use the kinds that won't get absorbed into the crop.
Some of the new organically approved chemicals are more dangerous than the old time things. do some checking & it will scare the **** out of you.