The term unsub in criminal terms is "Unknown Subject".
In criminal justice, and unsub is an unknown subject. This person is believed to be the source of criminal activity, and evidence ties a crime or multiple crimes to this one person. The term is often used on the show Criminal Minds to refer to a serial killer who the FBI is learning about but has not yet identified.
unsub
In the season five opener, he was shot by an unsub.
i think he is the deputy in "the rite of passage" who is really the unsub
Unsub - 2015 was released on: USA: 2015
An Unsub, or unknown subject, is the antagonist for each episode and the offender of a crime which the BAU team investigates. Sometimes there may be more than one unsub, and they can be male or female, young or even old.
The duration of Unsub - TV series - is 3600.0 seconds.
Unsub's birth name is Lily Alice Kaitlyn Luck.
Unsub - TV series - was created on 1989-02-03.
Unsub - 1989 was released on: USA: 3 February 1989
Unsub - TV series - ended on 1989-04-14.
Unknown Subject of an investigation or Unidentified Subject of an investigation.