Dried blood spot (DBS) technology is increasingly being adopted in forensic science as a reliable and efficient tool for collecting and analyzing blood samples. Originally developed for clinical testing and newborn screening, DBS kits are now finding new relevance in criminal investigations, toxicology, and evidence management.
This article explores how dried blood spot kits are used in forensic settings, from DNA profiling to drug detection, and why they are becoming a valuable tool in modern investigations.
In forensics, DBS cards are used in two primary ways:
DBS kits typically include a lancet, sterile filter paper card, alcohol swab, and detailed instructions. Once the sample is collected and dried, it is sealed in a tamper-evident pouch and labeled for the chain of custody.
DBS samples preserve nucleated cells, which makes them suitable for DNA extraction and profiling. Even a small disc punched from a dried spot contains enough material for:
Because the samples are dried and stable at room temperature, DBS cards provide a safer, more manageable alternative to liquid blood for long-term evidence storage.
Toxicological analysis from DBS is a growing area of interest. Using techniques like LC-MS/MS, forensic labs can detect and quantify:
DBS-based toxicology is especially useful in situations where collecting or storing venous blood is impractical, such as in field investigations or postmortem screenings in remote locations. Read our blog post on how dried blood spot cards are used in drug studies if you would like to learn more about the toxicological applications of DBS.
Dried blood spot kits offer several advantages in forensic settings:
These benefits make DBS kits ideal for high-throughput casework, cold case archives, and rapid deployment during emergencies or disaster victim identification.
While DBS has many advantages, it also comes with challenges that forensic labs must address:
Nonetheless, many forensic labs are working to standardize DBS workflows and incorporate them alongside traditional sampling methods.
RDA Spot designs DBS kits that meet the stringent requirements of forensic applications. Our cards are engineered to preserve sample integrity and support downstream DNA and toxicology analysis. We also provide customized solutions for law enforcement and forensic labs seeking to modernize their sample collection protocols.
As forensic science continues to evolve, dried blood spot kits offer a practical, scalable alternative to conventional blood sampling. From simplifying evidence collection to enabling drug screening in the field, DBS kits are poised to play an increasingly important role in the future of criminal justice.