I would agree with that. That seems to be very consistent with the evidence we have. It does not tend to be trespassers or unwanted visitors who bring pathogens onto farms: It's often people who don't follow the rules.
Mr. Steinley spoke about protocols on dairy farms. I'll note that one study showed that on Canadian dairy farms—and this was in 2019—less than 15% of farms had measures in place to limit or control visitors coming on and only half required visitors to adhere to infection minimization processes like changing boots and clothing. I think that oftentimes there are poor practices in place that don't comply with the voluntary biosecurity protocols.
Mr. Steinley also mentioned the C-section I described. I think that gets to the root of why people are concerned about customs on farms—