# Silent List (ALPR Hot List Domain) In the ELSAG/HIDTA ALPR platform, a **silent list** is a hot list whose hits are recorded and routed to investigators without generating the visible alert that an ordinary hot-list hit produces — a covert watch-list function. ASP requested a dedicated silent-list domain for investigative use. ## How it appears in the corpus ASP's requests are documented in the domain build-out: > *"Secondarily, Lt. Overton is requesting a 'AR Arkansas SP Silent List' domain for his CID use only."* (Tier-1 corpus, `RE_ MOU and Point(s) of Contact.msg`). > *"ASP is requesting a new silent list domain for their Interstate Criminal Patrol(ICP) hot list."* (Tier-1 corpus, `Arkansas State Police - Request for new SILENT LIST DOMAIN.msg`). See [[ASP–Houston HIDTA MOU and ELSAG Domain Architecture]]. ## Stakeholders - [[Dennis Overton]] / ASP Criminal Investigation Division and Interstate Criminal Patrol — the requesting/using units. - [[ELSAG ALPR Systems]] / [[Houston HIDTA]] — the platform on which the silent list is created. ## Timeline - **2025-05** — Overton requests a silent list "for his CID use only." - **2025-08** — ASP formally requests a new silent list domain for the ICP hot list. ## Notes The exact platform mechanics of a "silent" list (versus a standard alerting hot list) are not spelled out in this production; the description here reflects the standard meaning in ALPR systems and the corpus's use of the term. A silent list is an investigative-surveillance feature: it enables covert tracking of listed plates.