I'm pretty sure most of the crops in the US are regularly sprayed in urine and shit. Many of the immigrant workers used on farms are treated like slaves, locked up when they aren't in the fields or kept in overcrowded housing without basic utilities. These workers aren't getting bathroom breaks.

Even on farms that don't treat their workers so poorly they aren't installing bathrooms in the middle of the fields they truck workers out to, or ferrying them back and forth all day either. Workers couldn't afford take the time to run off to the bathroom even if they had the option. They have quotas to meet and are paid by how much they get done in a day. They're not walking off the job site to use the bathroom. They'll just piss/shit on your veggies and smile to themselves as they think about Americans who don't wash their produce.