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Fairfax County, Virginia
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Fairfax County Police Department

  1. Home
  2. Police
  3. Data Transparency

Alert:

CONTACT INFORMATION: 24/7 Emergency Response; Office and Program Hours Vary
703-691-2131 TTY 711 (Non-Emergency)
FCPDChiefsOffice@fairfaxcounty.gov
12099 Government Center Parkway
Fairfax, VA 22035
Kevin Davis
Chief of Police

Department Resources

  • FCPD Home
  • Leadership
    • Police Chief Kevin Davis
    • Department Leadership
    • Fallen Officer Memorial
  • District Stations
    • Fair Oaks
    • Franconia
    • Lorton
    • Mason
    • McLean
    • Mount Vernon
    • Reston
    • Sully
    • West Springfield
  • Bureaus
    • Administrative Support Bureau
    • Criminal Justice Academy
    • Internal Affairs Bureau
    • Major Crimes Bureau
    • Operations Support Bureau
    • Organized Crime & Intelligence Bureau
    • Planning & Research Bureau
    • Public Affairs Bureau
    • Resource Management Bureau
  • Community Partnerships
    • Ceremonial Services
    • Crisis Intervention Team
    • Equity Liaisons
    • School Resource Division
    • Get Involved
  • Real Time Crime Center
    • Learn about the RTCC
    • RTCC Transparency
    • Crime Solvers
  • Data, News, & Publications
    • FCPD News »
    • Fairfax County Police Open Data Portal »
    • Data Transparency
    • General Orders »
    • Critical Incident Updates
    • Officer Involved Shootings
    • Archived Publications
  • Records & Reporting
    • Central Records
    • Compliments and Complaints
    • Report a Crime
    • Report a Financial Crime
    • Report a Parking Violation
    • Report an Inoperative Vehicle
    • Virginia FOIA
  • Services
    • Claim Property
    • Concealed Handgun Permits
    • Disposal of Unwanted Firearms and Ammunition
    • False Alarm and Security Systems
    • Hire an Off-Duty Officer
    • Self-Contained Storage Unit Removal
    • Victim Services
  • Join FCPD
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Data Transparency

From Crime Report to Crime Data: seven steps from a call for service to published public data, with steps 5 to 7 repeating as an ongoing process.

Police data is not static. Investigations continue, reports are reviewed, and information may be corrected or reclassified as new details become available. Our public data is updated to reflect the most accurate information available.

From Crime Report to Crime Data

  1. 1

    Step 1: Something Happens

    A call for service is received, an officer responds, or an incident is reported.

  2. 2

    Step 2: Information Is Documented

    Officers document what is known at the time, based on initial information, interviews, and evidence.

  3. 3

    Step 3: Reports Are Reviewed

    Supervisors review reports for accuracy, completeness, and proper classification. Additional information may also become available.

  4. 4

    Step 4: Data Is Classified

    Information from the report is categorized according to applicable reporting standards and definitions.

  5. 5

    Step 5: Data Is Updated

    Follow-up investigation, new evidence, corrections, or additional review may change how an incident is classified or counted.

  6. 6

    Step 6: Data Becomes Public

    Once processed, information contributes to the statistics and datasets FCPD shares with the public.

  7. 7

    Step 7: Information Can Change

    Data keeps evolving and is never final. As cases develop and circumstances change, records are reviewed again and the published numbers are updated to stay accurate.

    ↻ Updates loop back to step 5.

Frequently Asked Questions (FAQs) - Incident Based Reporting (IBR) Data

The Fairfax County Police Department (FCPD) and the Commonwealth of Virginia both publish crime statistics using Incident Based Reporting (IBR). The numbers won't always match due to circumstances such as:

  • The state's numbers keep changing. A year's data isn't final when the state publishes it. Agencies keep sending corrections and new information, so a case from last year can still be updated.
  • FCPD sends data to the state once a month. Each monthly submission includes new cases and updates to older ones. FCPD's own public statistics are live and show what's in our records system at the moment you view them.
  • Investigations change over time. A witness may recant, evidence may reveal additional offenses, or an investigation may find that no crime occurred. These changes show up right away in FCPD's data but don't reach the state until our next monthly submission.
  • The state covers more agencies. The state's data can include every crime in Fairfax County, no matter which agency investigated it. FCPD is the county's largest law enforcement agency, but not the only one. Our statistics include only cases FCPD investigated.

FCPD reports every incident to the state using the standard IBR offense codes. The reports are the same. What can differ is how those codes are grouped into the summary figures each of us publishes.

For example:

  • The state may combine several IBR codes into a single "sex offenses" category.
  • FCPD may group the same offenses differently, either for clarity or to meet local reporting needs.

To make this easier to follow, FCPD is working to list which IBR codes are included in each summary statistic we publish, so you can see exactly what a number covers and why it may not match the state's figure.

IBR uses different counting rules depending on the type of crime:

  • Crimes against persons are counted by victim. If three people are assaulted in the same incident, IBR counts three crimes, one for each victim.
  • Crimes against property are counted by offenses. A single burglary counts as one crime, even if many items are stolen.

Because of these rules, two datasets can show different totals depending on what each one is measuring.

A robbery crime is classified as a "Crime Against Property" and is counted by offenses, not by victim. An assault occurring during, and in furtherance of, a robbery is typically not captured as a separate offense.

The theft and the property damage, both crimes against property, are counted by offense.

No. Older crime reporting systems counted only the most serious offense in an incident, a practice known as the hierarchy rule. IBR records every separate offense and counts each one using the rule for its category.

For example, if a single event involves an assault, a theft, and property damage:

  • All three offenses are recorded.
  • The assault, a crime against a person, is counted by the number of victims.
  • The theft and the property damage, both crimes against property, are counted by incident.

This gives a more complete picture of what happened. It also means totals can differ depending on which offenses or categories a dataset includes.

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