Nano Drones: The Newest Member of the Forensic Investigation Team
Imagine a crime scene inside an abandoned warehouse. Within the old and complex structure lie remnants of machinery, thick dust, and faint rays of light filtering through cracked windows. Forensic investigators must search for evidence with extreme caution, as critical traces could easily become contaminated—or vanish in the blink of an eye.
Furthermore, if the area contains chemical residues, unstable structures, or hidden risks that have yet to be assessed, investigators may unknowingly be exposed to danger.
But what if a tiny, intelligent “eye” could fly in first—before any human steps into the scene?
In an era where technology plays a pivotal role in the justice system, the application of nano drones—miniature unmanned aerial vehicles (UAVs)—in forensic science is gaining increasing interest. This is particularly relevant in enclosed crime scenes such as condos, private rooms, or warehouses, where space constraints, limited access, and the fragility of evidence make traditional investigation more difficult. Nano drones thus serve as an “intelligent eye” that can be deployed to capture images, gather data, and analyze the environment in detail—without disrupting the original evidence. This reduces risk, enhances safety, and significantly advances the process of uncovering facts.
What Are Nano Drones?
Nano drones refer to ultra-small unmanned aerial vehicles (UAVs), typically weighing less than 250 grams and measuring no more than 15 centimeters in length. A key feature of nano drones is their ability to navigate through confined or complex spaces—such as bedrooms, narrow corridors, or small gaps between furniture. These drones are often designed for high agility, capable of stable hovering, precision movement, and flexible flight within space-restricted environments.
In terms of technology, modern nano drones are equipped with several advanced features, such as:
• High-resolution cameras to capture still images and video from angles inaccessible to the human eye
• Infrared systems or LiDAR for detecting objects in dark or smoke-filled areas
• Artificial Intelligence (AI) and Computer Vision to assist in real-time image analysis and decision-making
• SLAM (Simultaneous Localization and Mapping) systems for indoor navigation and map generation
With these capabilities, nano drones play an essential role in missions that require both precision and safety, such as crime scene investigation, hazardous area assessment, or even real-time reconnaissance—without the need for human entry. This has made the technology increasingly valuable in the fields of forensic science, public safety, and disaster response.
source: https://spectrum.ieee.org/drones-as-detectives-surveying-crime-scenes-for-evidence?utm_source=chatgpt.com
The Origins of Nano Drones in Forensic Science
The idea of using drones to assist with evidence collection began in 2019 with Pompílio Araújo, a forensic scientist with the Federal Police of Brazil, in collaboration with researchers from the Federal University of Bahia. They launched the development of an “autonomous drone system for crime scene investigation” under the name AirCSI.
The core concept behind the project was to reduce human contact with fragile evidence at crime scenes. Instead, drones would be deployed to survey, record, and analyze crime scenes with high precision—utilizing imaging technology and AI as key tools.
The AirCSI system integrates multiple smart technologies. First, the drone surveys the scene from above using stereo cameras and a Simultaneous Localization and Mapping (SLAM) system, further developed into Air-SSLAM to help the drone understand its environment and autonomously map the area. A downward-facing camera is then used to detect critical objects using an AI model called YOLO v3, trained to recognize suspicious items such as firearms or weapons. The system can be further trained in the future to detect bloodstains, fibers, or bullet casings.
Once a target object is detected, the drone doesn't just take a snapshot—it calculates a circular flight path and performs zigzag movements to capture images from multiple angles and distances. Experimental results showed that multi-angle imagery increased object recognition accuracy by up to 18% compared to single-angle images.
Tests conducted in a simulation environment demonstrated that AirCSI could:
• generate a 3D map of the crime scene,
• record detailed images of evidence, and
• produce reports that help investigators gain a comprehensive understanding of the case.
Despite limitations—such as the lack of real-time obstacle avoidance and best performance only in open spaces without dense furniture—AirCSI marks a major first step in systematically incorporating robotics and AI into forensic work.
Looking forward, the research team aims to improve the system by:
• expanding object recognition capabilities through AI training,
• conducting field tests in real-world crime scenes, and
• developing a virtual crime scene reconstruction system, allowing investigators to re-examine the scene digitally from every angle, at any time.
source: https://arxiv.org/abs/2502.21019
2025: Nano Drones in Action—The Halmstad University Prototype
In 2025, a research team from Halmstad University in Sweden introduced a groundbreaking concept and prototype for using nano drones in indoor, enclosed crime scenes. Their research focused on developing a technology that would reduce risk to forensic personnel and enhance the efficiency of data collection—particularly in hard-to-access or physically constrained areas.
Using a method known as speculative prototyping, the team designed and tested future-oriented drone concepts under simulated conditions. They developed a nano drone prototype weighing under 250 grams, equipped with cameras and sensors that could detect, analyze, and maneuver accurately within restricted environments.
The prototype drone was tested on three core missions:
1. Entering through narrow spaces—e.g., flying through a partially opened window—demonstrating the drone's ability to access areas not directly reachable by human investigators.
2. Mapping the interior and locating evidence—using SLAM technology to create a layout of the scene and mark precise positions of evidence items.
3. Detecting and analyzing blood smear patterns—which help reconstruct events and understand the movements of the victim or perpetrator.
Initial success rates were promising:
• 75% for entering narrow areas,
• 85% for mapping and evidence identification,
• 80% for blood smear analysis.
While not yet perfect, these results signal a meaningful leap in applying miniature robotics to forensic investigations—traditionally labor-intensive and limited by time, contamination risks, and personal safety.
Global Trends and Emerging Standards
The integration of drones into forensic investigations is not an isolated trend. It is becoming a global movement, particularly evident in academic and professional conferences on forensic technology and robotics. Events such as the IEEE International Symposium on Safety, Security, and Rescue Robotics (SSRR) and the Forensic Europe Expo in London regularly highlight topics related to drones, mini-robots, and autonomous systems in crime scene processing.
These platforms reinforce that this technology is no longer a futuristic concept confined to research labs but is on the path to becoming a standard tool in global criminal investigations.
Challenges and Limitations of Nano Drones in Forensics
Despite their potential, nano drones face several limitations that need to be addressed before they can be widely adopted in real-world forensic operations:
1. Limited Flight Time Due to their small size and lightweight design, nano drones typically operate on compact batteries, allowing only 10–15 minutes of flight per session. This requires careful mission planning and optimization of image capture routes and recharge points.
2. Signal Interference Indoors Concrete walls, steel structures, and interference from other electronic devices can disrupt drone control and delay image transmission or real-time processing.
3. Camera Resolution Limitations Although drone cameras have greatly improved, they still lag behind specialized forensic imaging tools like DSLR or multispectral cameras, especially in low light, zoom capability, and fine trace detail.
4. Legal and Privacy Concerns Deploying drones in private spaces such as homes or private properties may raise legal and privacy issues. Proper authorization—such as court warrants or owner consent—is necessary. Additionally, privacy and data protection laws must be respected.
Outlook in Thailand
As of now, nano drones are not yet used in forensic operations in Thailand. However, with advancing technology and growing affordability, the country could soon see the emergence of "Thai-made nano drones" being deployed at crime scenes.
If supported by coordinated development among the Royal Thai Police, forensic science institutions, and leading technology universities, these systems could become integral to modern investigations.
Such investment would not only reduce risks to forensic personnel but also help prevent evidence contamination and improve the precision of fact-finding in criminal cases.
References
Cooney, M., Ponrajan, S., & Alonso-Fernandez, F. (2025). Nano Drone-based Indoor Crime Scene Analysis. https://arxiv.org/abs/2502.21019
Michelle Hampson. (2019). Drones as Detectives: Surveying Crime Scenes for Evidence. IEEE Spectrum. https://spectrum.ieee.org/drones-as-detectives-surveying-crime-scenes-for-evidence?utm_source=chatgpt.com
