HomeMy WebLinkAboutPRA 2026-128 (Flock)_City Council Study Session Presentation - 07.18.2023ALPR Surveillance Systems
City Council Study Session
July 18, 2023
Automated
License Plate
Readers
(ALPR)
■Investigatory tool that
monitors vehicle location,
travel patterns, etc.
■Collects data, cross-checks
with law enforcement
databases for stolen
vehicles and warrants.
Cameras are placed on street/signal
light poles, approx. 15 feet above
ground, hard-wired or solar-powered.
Best practice is to place at
ingress/egress locations.
Cameras capture an image of the
vehicle, plate, and can identify make,
model, color, and features like stickers
and roof racks.
Location
System Capabilities
ALPR Data
belongs to
system owners
searchable in
the cloud and
can be
downloaded
and stored
locally
stored on cloud-
based servers
leased by system
provider
■Identify stolen vehicles that enter
surveillance area.
■Supplement investigations where a
witness or other evidence exists.
Deployment will not eliminate property
crime nor does it guarantee a decline..
ALPR System
Can be a powerful tool for law
enforcement investigators to:
Walnut Case Study
All data provided by LASD
■56 individuals in custody.
Since launch of Flock system:
■64 vehicles recovered.
■Generation of leads on other
cases.
■Majority of arrests related to
stolen vehicles.
La Canada Flintridge Case Study
All data provided by LASD
■13 vehicles recovered
Flock System Results in 2022:
■20 leads generated by Flock hits.
■1 arrest
San Dimas Case Study
All data provided by LASD
■No data available for vehicles
recovered and arrests made.
Flock System Results in 2022:
■9 leads generated by Flock hits.
Part 1 Crimes – Burglary
Of the sample, DB has the second-
lowest per capita rate.
City 2020 2021 2022
Diamond Bar 236 221 256
La Canada Flintridge 72 51 106
San Dimas 104 122 143
Walnut 108 83 152
Part 1 Crimes – Clearance Rates
Clearance rates are higher in other
sample cities.
City 2020 2021 2022
Diamond Bar 9%12%8%
La Canada Flintridge 15%14%15%
San Dimas 17%10%10%
Walnut 17%19%13%
ALPR Key Points
scope can be
narrowed if cost
is a factor, but it
will impact
effectiveness
estimated annual
cost to deploy a
Flock system is
approximately
$175,000-$200,000
most effective
when deployed
at ingress and
egress locations
Other Considerations
■expected advances in
technology
■use and access policies
■Public Records Act
■camera placement policies
■training considerations
■privacy concerns
Questions and Discussion
City Council Study Session
July 18, 2023