Good luck, I'm glad it was meaningful for you.
I read their literature, the pre and post blood level tests. PRE is to prove you didn't have it beforehand, and POST is probably to get statistical proof of training efficacy, or failure.
We had non-toxic simulators for nerve agent detention and decontam, and once we had been denied CS tear gas, we went to "pepper fog" (not capsicum, but it smelled like green bell peppers...which is supposed to be one way of describing nerve agent).
If there is no risk that you will get in contact with it, then why use it? Again, get a stiff exposure to CS (or CN if you want to get hard core) and you will rapidly learn the value of respecting you donning and recovery training. (Don't they train you what to do if your mask is knocked loose or you have to change filters in a persistent hostile atmosphere?).
Anthrax? What sort of permit process do they need to go through for that? There are islands off England which are uninhabited because anthrax was tested there and the spores are endemic now. If you catch a case, (see "since you will not be exposed" above), what fresh kinds of trouble will someone be in for it ? Anthrax is also a disease of veterinary interest.
I'll send them an email.