Highland Park Shooting: When Scanner Access Saved Lives
During one of the deadliest mass shootings in recent American history, open police scanner access gave civilians real-time information that helped them take cover, avoid the active shooter's path, and find loved ones. It also showed, in the starkest possible terms, what police encryption would have cost.
What happened in Highland Park
On July 4, 2022, during Highland Park's Independence Day parade, a gunman opened fire from a rooftop, killing seven people and wounding dozens more. Official communication channels were overwhelmed. Emergency alerts lagged. Social media filled with conflicting rumors.
One source had accurate, real-time information: open police scanner access.
The gear that made this possible—and what still works today
Highland Park worked because police radio was open. If your region has gone the Chicago route, no gear restores that access—encryption is still the problem. But for the unencrypted layer (NOAA weather, adjacent open agencies, federal, aviation, amateur), here's what listeners rely on for situational awareness during emergencies.
How scanners saved lives that day
- People monitoring police scanners knew about the active shooter within seconds — long before official alerts went out.
- Real-time police communications helped civilians understand where the shooter was, where police were searching, and which areas to avoid.
- Families used scanner information to locate relatives separated during the chaos and understand which areas were safe.
- Journalists monitoring scanners provided accurate public updates, countering rumors and reducing panic.
- People with scanner access didn't need to call 911 for information, leaving lines open for actual emergencies.
The timing that matters most
In active shooter situations, seconds matter. The difference between cover and exposure, between running toward danger and away from it, between finding a family member and hours of not knowing.
Highland Park's police department had not encrypted their radio. That meant:
- News media could broadcast live updates based on real police activity
- Apps like Broadcastify streamed real-time scanner audio
- Residents with scanner receivers got unfiltered information immediately
- No 30-minute delays (like Chicago's encrypted system imposes)
- No waiting for official press releases while events unfolded
How information flowed on July 4, 2022
Shooting Begins
Gunman opens fire from a rooftop along the parade route. Pandemonium as parade-goers scatter. First 911 calls flood the dispatch center.
Scanner Traffic Alerts Listeners
Highland Park police radio immediately fills with urgent traffic. Scanner listeners across the region hear about the active shooter within seconds of the first dispatch.
Real-Time Situational Awareness
Scanner traffic provides shooter's suspected location, description, and direction of movement. People still at or near the parade route use this information to flee in the opposite direction.
Search Expands
Police expand search perimeter. Scanner listeners know which areas are being cleared and which remain potentially dangerous—helping separated families understand where to reunite.
Media Provides Verified Updates
Local TV and radio stations monitoring scanners broadcast accurate information, countering social media rumors about multiple shooters and false safe zones.
Official Alerts Catch Up
Emergency management sends official alerts—nearly 45 minutes after scanner listeners already had accurate, actionable information.
Suspect Apprehended
Throughout the manhunt, scanner traffic keeps the public informed about search areas and police activity. Suspect caught in North Chicago after traffic stop.
Scanner listeners had actionable information 45+ minutes before official alerts went out. In an active shooter situation, those 45 minutes represent thousands of decisions made with real information instead of rumors or silence.
Voices from July 4th
Scanner access meant different things to different people that day:
Separated family
"When the shooting started, my husband grabbed our two kids and ran one direction while I got separated in the crowd. The scanner told me where police were setting up a reunification point. I found them within 30 minutes instead of hours of not knowing."
Scanner information enabled family reunification during active chaos.
Nearby resident
"I live three blocks from the parade route. When I heard the sirens, I turned on my scanner. I knew exactly when it was safe to shelter in place and when police had cleared our area. My neighbor without scanner access was terrified for hours."
Informed decisions about personal safety based on real police activity.
Local journalist
"Social media was a mess—rumors about multiple shooters, wrong locations, fake safe zones. We could provide accurate, verified information because we were listening to what police actually knew. That's what journalism is supposed to do in emergencies."
Accurate media coverage countered dangerous misinformation.
Downtown business owner
"I had employees at the parade and customers in my store. The scanner told me which areas were safe. I could tell my employees which direction to run and keep my customers informed about when it was safe to leave. That information probably saved lives."
Business owner could protect employees and customers with real-time information.
What if Highland Park had been encrypted?
Police departments across Illinois and the country have been moving to full encryption. If Highland Park had encrypted their police radio on July 4, 2022:
With encryption
- No real-time scanner access for the public
- Journalists dependent on official statements only
- 30-minute delays (or longer) for any information
- Families unable to track police activity
- Increased 911 call volume from people seeking information
- Social media rumors filling the information vacuum
Without encryption (what actually happened)
- Immediate public awareness of the threat
- Real-time media updates based on police activity
- Informed decisions about safety and movement
- Families could track search areas and safe zones
- Reduced panic through accurate information
- Independent verification of official accounts
A pattern, not an exception
Highland Park is not a one-off. Open police scanner access has proved its value repeatedly during emergencies:
- During active shooter events, real-time radio traffic warns residents to shelter in place or avoid specific areas
- During natural disasters, tornado paths, wildfire evacuations, and flood zone boundaries reach people before official channels update
- Bomb threat evacuations and safe perimeters get communicated immediately
- Dangerous vehicle pursuits through neighborhoods are trackable in real time
- Chemical spills and hazmat incidents create immediate public awareness of affected areas
The encryption trend threatens this access
Despite cases like Highland Park, police departments nationwide are encrypting radio at an accelerating pace. The stated reasons—officer safety, victim privacy—are unsupported by evidence in multiple departments' own records searches.
The documented benefits of open access—lives saved, accurate reporting, public accountability—disappear when a department flips the switch.
What happened in encrypted cities
Compare Highland Park's open communications to what unfolded in Chicago, where police radios are encrypted:
Chicago courthouse shooting (2022)
A gunman fired more than 40 shots outside a courthouse. Police responded. The public never knew in real time. No scanner alerts, no immediate media coverage. Thirty minutes later, a sanitized press release.
People near the courthouse had no idea they were in danger until it was over.
The evidence is clear
Open police scanner access saves lives during emergencies
The Highland Park shooting showed what public safety advocates have argued for years: real-time access to police communications is a safety tool, not a threat.
When police departments encrypt their radios, they do not just restrict journalists or frustrate hobbyists. They cut off a public safety resource with a proven track record at the moments when it matters most.
What you can do
If your local police department is considering encryption, or has already encrypted their communications:
- Contact your city council members and express concerns about public safety
- Request documentation of any incidents where scanner access caused harm (there likely is none)
- Advocate for hybrid systems that protect sensitive operations while keeping routine dispatch open
- Share real-world examples like Highland Park with decision-makers
- Support local journalism that relies on scanner access for breaking news
- Join or organize community opposition to blanket encryption policies
Take Action for Transparency
Your voice matters. Here are concrete ways to advocate for open police communications in your community.
Contact Your Representatives
Use our templates to email your local officials about police radio encryption policies.
Get StartedRead Case Studies
See how encryption has affected real communities - from Highland Park to Chicago.
View CasesSpread Awareness
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Public Testimony
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Sources & Further Reading
- Colorado Public Radio: Coverage of Highland Park scanner usage
- ABC7 Chicago: Highland Park shooting timeline and scanner audio
- Local news reports documenting scanner-based public alerts
- Radio Television Digital News Association (RTDNA) encryption concerns