Why this standard exists. Los Angeles County's documented follow-home casework—task-force prosecutions, agency advisories, and the regional pattern analyzed across our published threat assessments—identifies one window as the most consistently exploited moment in residential targeting: the arrival sequence, the transition between a vehicle and a locked door. Selection frequently begins away from the home—at restaurants, retail, or events; the attack concludes in a driveway. The window is short—often under a minute—predictable, and almost universally unmanaged.
Despite this, no published, adoptable standard for managing the arrival window exists. Security firms treat arrival practice as proprietary craft; households improvise or ignore it. This document ends that gap.
The Arrival-Sequence Protocol (ASP-1) is published as an open standard: any household, estate manager, HOA, family office, or security provider may adopt, implement, and reference it, under the terms in §7.
We publish it openly for the same reason fire codes are public—a protective discipline serves best when everyone can hold everyone to it.
§1 — Scope
ASP-1 covers the residential arrival and departure windows: the period from final approach—the last stretch of travel toward the residence—through secured interior transition, and its reverse. It applies to principals, family members, household staff, and regular vendors. It does not cover venue-side protection, transit security between locations, or interior household security—those belong to the adjacent zones of a full protection framework.
§2 — Definitions
The interval from final approach until every arriving person is inside a secured structure with entry points closed. The casework's exploited period.
The documented pattern in which subjects are selected at a public venue and followed to the residence, where the arrival window provides the confrontation opportunity.
The moments when occupants are outside the vehicle but not yet inside the secured structure—the window's peak vulnerability.
An arrival window managed under this protocol, with or without a professional presence.
§3 — The Protocol
A suspected follow never terminates at the residence.
§4 — Implementation Levels
| Level | Required Scope | Operating Model |
|---|---|---|
| Level A — Household Practice | ASP-1.1 through 1.5 and 1.8 | Implemented by the household itself. Zero cost beyond lighting; the majority of the protocol's protective value. |
| Level B — Managed Arrival | Level A plus ASP-1.7 | Staff and vendor integration, typically coordinated by an estate manager or building operator. |
| Level C — Covered Arrival | Levels A–B plus ASP-1.6 | Professional timed presence during the household's live arrival windows. The full standard. |
§5 — Verification
An arrival program is ASP-1 aligned when:
- Every household member and driver can state the Diversion Rule unprompted.
- The garage discipline—or its non-garage equivalents—is observed on unannounced review.
- The arrival path passes a lighting-and-concealment walk.
- At Level C, coverage logs demonstrate presence timed to actual arrival windows.
Providers claiming alignment should welcome all four checks.
§6 — Relationship to the Four-Zone Framework
ASP-1 is the open publication of Zone 2 of the four-zone residential protection framework—off-property awareness · the arrival sequence · perimeter and grounds · household access. The full framework is documented in our 2026 Complete Guide to High-Net-Worth Security in Los Angeles County; this standard makes its most exploited zone freely adoptable.
§7 — Open License & Adoption
ASP-1 may be adopted, implemented, reproduced in operational documents, and referenced by any household, association, or provider, without fee. The sole conditions: the standard is referenced by name—the Arrival-Sequence Protocol (ASP-1)—with attribution to Safety Host Unit as publisher, and no altered version is represented as the standard. Providers may describe conforming services as “ASP-1 aligned.” Proposed revisions are welcome at info@safetyhostunit.com and considered for future versions.
§8 — Version History
- v1.0 — September 2026. First public release. Codifies the arrival-sequence doctrine developed across Safety Host Unit's residential practice and published threat assessments, 2025–2026.
Frequently Asked Questions
What is the Arrival-Sequence Protocol?
An open, versioned standard for protecting the residential arrival window—the documented transition between vehicle and locked door that LA County's follow-home casework identifies as the most exploited moment in residential targeting. Published by Safety Host Unit for free adoption by households and providers.
Why publish a security protocol openly?
Because the arrival window endangers every household, not only clients—and a protective discipline works best as a shared standard everyone can implement and verify. Open publication also lets families audit any provider's arrival practice against a common benchmark.
What is the most important rule in ASP-1?
The Diversion Rule: a suspected follow never ends at the residence—the arrival diverts to a well-lit public location or police facility. It costs nothing and defeats the follow-home pattern's core mechanism: learning where you live.
Can other security companies use ASP-1?
Yes—that is the point of an open standard. Any provider may implement it and describe conforming services as ASP-1 aligned, with attribution per §7.
How does ASP-1 relate to full estate security?
It is Zone 2 of the four-zone framework published openly. Households wanting the complete architecture—off-property awareness, perimeter, and household access—should read the full framework guide.
The Arrival-Sequence Protocol is published and maintained by Safety Host Unit—California PPO #120547 · Beverly Hills & Downtown LA · Part of the SHU Open Standards series · (888) 703-4004 · Consultations.
