"Yes and no." It could really go both ways. "All weapons which can kill a vampire are made from a specific metal, created strictly for that reason. Normal ones still can inflict harm upon them, but don't cause any lasting damage. Meanwhile, even a small cut made by one of these can hurt, and take much longer to heal. The only way to really speed that up is if the vampire consumes fresh blood. Anti-vampire weapons are also incapable of harming humans."
He pauses, maybe faintly amused. "Not that it always takes one of these to apprehend a vampire, but they do come in handy."