Yes! He can tell right away it's vampire blood. Haelva's ravens will also react aggressively to the container as though it contains something or is associated with something they do not like.
There's enough blood in it to perform one test. They can choose to:
1. Hold onto the vial and wait for more information, then try to match it to the person they believe is the culprit. This would make it admissible as evidence should the right person be caught.
2. Bring it to the Vaults and perform a match with the blood signature. This will confirm that the vial is connected to the crime and not a red herring, but would still leave the identity of the person unknown.
no subject
There's enough blood in it to perform one test. They can choose to:
1. Hold onto the vial and wait for more information, then try to match it to the person they believe is the culprit. This would make it admissible as evidence should the right person be caught.
2. Bring it to the Vaults and perform a match with the blood signature. This will confirm that the vial is connected to the crime and not a red herring, but would still leave the identity of the person unknown.