At first glance, forensic science and cryotechnology are unusual partners. But on closer inspection, it becomes clear that the preservation of biological traces - DNA, blood, tissue, hair - is a central element of modern forensic technology. And the most reliable method of preserving these traces for years or decades is cryopreservation.
Cold cases - criminal cases that remain unsolved for years - are often only solved using new analytical methods that did not exist at the time the evidence was secured. For this retrospective analysis to be possible, the evidence must be preserved in a state that preserves its molecular integrity. This is precisely where cryogenic storage comes in.
In this article, we shed light on the role of cryostorage in forensic science and show what requirements are placed on the technical infrastructure.
Biological traces - especially DNA - are subject to continuous degradation at room temperature. Enzymes (DNAsen) decompose the DNA strands, bacteria and fungi break down organic material, and chemical oxidation processes change the molecular structure.
A DNA sample stored at room temperature can be so severely degraded after just a few months that a meaningful STR (short tandem repeat) analysis is no longer possible. At -196°C in liquid nitrogen, on the other hand, all biological activity is suspended - the sample remains preserved in its state at the time of freezing, theoretically indefinitely.
In many countries, DNA reference samples from convicted criminals or suspects are stored in forensic databases. The long-term storage of these samples at cryogenic temperatures ensures that they are available for comparative analyses even decades later.
Biological traces from the crime scene - blood stains, hair, skin cells under fingernails - are cryopreserved in forensic laboratories after being secured. This is particularly important in cold cases, where the investigation often takes years or decades after the crime.
In the event of mass disasters or missing persons cases, large quantities of tissue samples must be systematically stored until all victims have been identified. A scalable cryobank with professional sample management is essential here.
In forensic medicine, tissue and organ samples from autopsies are often cryopreserved to enable later toxicological or histological examinations. The quality of the preservation determines whether the findings can be used in court.
In forensics, complete documentation of the chain of custody is legally crucial. Every sample must be traceable from the time it is secured at the crime scene to its analysis in the laboratory. Digital sample management with a barcode system and automatic audit trail is therefore essential.
The storage conditions must be designed in such a way that the samples cannot be tampered with. This includes access controls to the cryo room, individual user IDs and tamper-proof data recording.
Forensic samples are potentially stored for decades. The reliability and service life of the cryogenic tanks is therefore a top priority. The stainless steel tanks of the Consarctic® BSD+ series offer outstanding vacuum stability and are designed for continuous operation over many decades.
Forensic DNA analysis has developed rapidly over the last 30 years. Methods that are routine today - such as next-generation sequencing (NGS) or the analysis of epigenetic markers - did not exist ten years ago. Samples that were cryopreserved back then can now be analyzed using these methods and previously unsolved cases can be solved.
This potential underlines the value of high-quality cryostorage: Any sample that is safely stored today could provide crucial evidence tomorrow.
Consarctic® offers forensic laboratories and forensic institutes customized cryo solutions:
Forensics is an area where the quality of cryogenics can directly determine justice and truth. A sample that degrades due to poor storage does not just mean a scientific loss - it may mean that a crime goes unpunished.
Do you need a cryogenic infrastructure for your forensic facility? Our experts can advise you on all aspects of forensic sample storage - from individual solutions to complete cryobanks.