Charming Speaker who interprets the law

You are the Sheriff in the market town of Houndsmoor—
the closest town to Wivelscombe. You’re the only police
force in the town, and one of just a handful in the County,
so after the disappearance of the Waller children the County
called in help from the State Police , who have expertise in new methods of
gathering evidence.
In your initial inquiries you’ve found that the villagers
are convinced a vampire is to blame. (The legend of a local
vampire goes back centuries, but there are no cases—at
least in your lifetime—that anyone has attributed to the
vampire.)