What can a detective do to lay a ghost?

Some kinds of music will lay a ghost.

Come here and help to lay a ghost.

I can help you in that-butbefore I do, I think you've got to lay a ghost.

I feel as if I'd laid a ghost, and popped a stone on its grave.

I'd love to be able to tell the paranormal crowd that I laid a ghost to rest all by myself.

Laying a ghost is all right, but if I rode a horse as you do, I'd assign the ghosts to others.