Subject: Re: 2 more Chinese bioterror arrests
That's certainly one opinion. However, given Bill's post about Michigan's stature in the bio community and the fact that all 3 men were doing research there, it's highly likely that all three were well aware of lab protocols regarding such things. And given that they received "several" shipments according to the statement there's a pattern there.

Could be a common mixup or it could be precursors for a bioweapon.

Right now there's not enough info to know what it is.