The risk group of pathogens, like salmonella, or the E. coli that caused the Walkerton incident, when grown in certain concentrations are dangerous. It is important for laboratory workers to be protected against those pathogens and apply the laboratory biosafety guidelines.
A number of these pathogens can be spread, if it's an enteric pathogen, to the immediate family or to their community. If someone chooses to access them for nefarious means, for bioterrorism events, then they're obviously more prevalent. We're not concerned about the biosecurity piece as much for risk group 2, but we are concerned that they are still pathogens that cause disease in humans and must be handled according to good biosafety practices.
If we left it to, of course, provinces or research councils or private labs to do things differently, what you would end up with--and actually it's the gap today--is an extreme patchwork of some people following these, like these good researchers, and then there are laboratories that do not follow laboratory biosafety procedures. Level 2 pathogens can cause significant disease in humans.