They have some in vaults, probably some in some bioweapon research facilities, but that's it.

Dom knew Marcus's father had visited Vectes when it was a bioweapons research facility, and so did Marcus.

Oh, and they were instrumental in the deaths of a number of microbiologists, who were working on bioweapons research.

The Centers for Disease Control has suspended bioweapons research at Texas A&M University, after the school failed to report four workers' exposure to biological agents.