The problem with this practice(s) is that it yields a terrible product, this is what is usually done in most of Europe (outside of NL) where MJ is illegal, and what they end up with is an uncontrolled field of male and female plants that almost ALWAYS has been pollinated by the male plants. This why mj in Europe not from NL is usually quite awful and often converted to hash as the bud that remains is usually of such poor quality that it doesn't carry a big enough price to warrant the risk.

My apprenticeship as a master gardener was based upon using Cannabis as a companion crop, and I can tell you right now the two are completely incompatible: cannabis' deep root system makes it a poor choice next to a heavy feeder like corn as they will compete for nutrients and eventually stunt both yields, prevent airflow, compete for sunlight while stressing the plant to create more fan leafs than flower, almost all of corn cultivation in the World is heavily sprayed with pesticides and artificialfertilizers etc... Corn is literately the worst crop we cultivate for many reasons, but primarily due to soil erosion and soil depletion due to its very growing cycle, add to that equation that cannabis which will take anything and everything from the soil and you're setting yourself up for failure as you're damaging the soil's ecology.

I can go on if you'd like, but the truth is if you live in an area like that, your best bet is to resort to indoor grows where you have far more controlled settings, and this is from someone who only takes actual pleasure in outdoor grown mj. The problem is that most grows in these areas are not undertaken with care as quality and standards for personal consumption isn't the aim, but rather a quick profit.

PS: My last year in I had to clean the remnants of a large fox and what appeared to be its litter (too many little feet attached to the walls) from a combine by hand after a 3rd cut hay harvest... a human, while larger, wouldn't fair any different in one of those.