Using magic means it uses you back - and every spell exacts a price from the user. Some people, however, get out of it by Offloading the cost of magic onto an innocent, then Allison Beckstrom's job is to identify the spell-caster.
Allie would rather live a hand-to-mouth existence than accept the family fortune and the strings that come with it, but when she finds a boy dying from a magical Offload that has her father's signature all over it she is thrown back into the world of his black magic. (by goodreads.com)
Magic in the Blood
Working as a Hound—tracing illegal spells back to their casters—has taken its toll on Allison Beckstrom. But even though magic has given her migraines and stolen her recent memory, Allie isn’t about to quit.
Then the police’s magic enforcement division asks her to consult on a missing persons case. But what seems to be a straightforward job turns out to be anything but, as Allie finds herself drawn into the underworld of criminals, ghosts, and blood magic.(by goodreads.com)