Enhancing Speech Privacy in Police Interrogation Rooms

At the Miami-Dade Police Department’s Fred Taylor Headquarters Complex in Doral, Florida, investigators faced a significant challenge: conversations from one interrogation room were clearly audible in adjacent rooms. This issue compromised the integrity of investigations and posed risks of suspect collusion. To address these concerns, Commercial Acoustics was engaged to implement a comprehensive acoustic treatment plan that would ensure complete speech privacy across the facility’s interrogation rooms.

The complex houses four clusters of interrogation rooms, each serving different divisions, including Homicide, Robbery, Special Victims, and Human Trafficking. These high-use spaces remained in service throughout the buildout, so the project was phased strategically—one suite at a time—allowing uninterrupted access to remaining rooms. Commercial Acoustics ensured consistent results across all departments, meeting operational needs while significantly improving speech privacy facility-wide.

The first step in the acoustic treatment was stripping the demising walls to the studs and rebuilding with Wall Blokker PRO and new double drywall assemblies to boost Sound Transmission Class (STC) ratings. This construction method effectively blocked sound transfer between rooms. Additionally, acoustically transparent fabric-wrapped stretched wall panels were installed to reduce internal echo and enhance voice recording clarity. Overhead, a plenum-based sound masking system added an soundproofing panels miami extra layer of discretion, masking residual sound that could otherwise leak above walls or through ceiling tile systems.

Even with strong wall assemblies, sound can still leak through untreated doors. To solve this, Commercial Acoustics installed complete perimeter and bottom door seals for every room. These seals prevented acoustic bleed from entering or leaving the room, especially critical in open-plan police bullpen environments. The result was a completely contained space—protected from internal and external distractions alike.

While not acoustical, fiberglass-reinforced plastic (FRP) panels were installed on remaining wall areas at the client’s request. These panels improved the room’s durability and cleanability, which are essential in law enforcement environments due to their resistance to impact and staining.

The installation process was meticulously planned to minimize disruption. Work was timed to avoid disrupting active case interviews, with one room cluster treated per week over a three-week span. This phased approach allowed the police department to maintain operations without compromising the integrity of the acoustic upgrades.

The outcome was a significant enhancement in the facility’s acoustic environment. Conversations were no longer intelligible in neighboring rooms or hallways, allowing investigators to conduct simultaneous interviews without interference. Victims and witnesses could speak without fear of being overheard, directly supporting procedural compliance and protecting sensitive information in a legal environment.

This project underscores the importance of integrating acoustic solutions in law enforcement facility design to meet privacy requirements and enhance the investigative process. By proactively addressing acoustic challenges, police departments can create environments that protect confidential information and support effective law enforcement practices.

For more information on how sound masking can support privacy and improve acoustic conditions in law enforcement settings, visit Commercial Acoustics’ case study on the Miami-Dade Police Department’s interrogation rooms.