Detainer
Detainer (-ẽr) , noun
1.
One who detains.
2.
(a) (Law) The keeping possession of what belongs to another; detention of what is another's, even though the original taking may have been lawful. Forcible detainer is indictable at common law.
(b)
(Law) A writ authorizing the keeper of a prison to continue to keep a person in custody.