Re: It's all in the 'title'
Thats works for doctors and teachers, but farmers?
There's a lot of stuff I could've slipped into the ground, the animals, or the milk vats that you'd not want to know about, and some of it could cause real harm if it was undetected.
It's simply not economically feasible to test every bit of produce (including meats and liquids), so the farmer's reputation is what you have to trust, and that of their workers. Enough distrust and whole industries can be hurt badly.
(BTW, on a real farm an 18yo kid should have pretty damned close to 18 years farming experience! (and at least 10 years driving heavy machines :) )