Certainly, I am not an expert in saying what resources the CFIA have or don't have available to them. In my personal interpretation, reading the bill through, as a person who has supported the development of regulation and continues in a career that regulates, I guess there are a couple of ways of looking at it.
If I was writing the guiding notes on this, and someone was putting together the regulation, I think it could be interpreted that as long as the person who has entered the premises, or the enclosed space or building, did not follow the required biosecurity processes for that building, then they have broached the biosecurity.
For all the industries I've worked with, every barn has a standard. If you don't follow that standard, then, essentially, to me, you are broaching it.
If there's also a trespass, an undocumented trespass, the CFIA wouldn't be documenting the trespass. The biosecurity issue could be addressed quite simply by whether protocols were followed or not followed.