New Forensic DNA Survey Links Contamination Concerns to Workload and Fatigue

DNADNA, or Deoxyribonucleic Acid, is the genetic material found in cells, composed of a double helix structure. It serves as the genetic blueprint for all living organisms. Read Full Definition contaminationContamination - The unwanted transfer of material from another source to a piece of physical evidence. The inadvertent touching of a weapon, thereby adding fingerprints to it is an example of evidence contamination. Read Full Definition is not only a question of gloves, cleaning and laboratory layout. A newly published survey of 100 forensic practitioners suggests that workload, fatigue and time pressure deserve attention alongside conventional technical controls. The peer-reviewed article was published online on October 14, 2026, in the Bulletin of the National Research Centre.

Researchers Salem K. Alketbi and Fatima S. Ahmed examined practitioners’ perceptions of human-factor risks, their experiences of contamination incidents and near-misses, and their priorities for prevention. The findings are relevant to DNA analysts, crime scene investigators, technical managers and quality officers, but they require careful interpretation: this was an exploratory survey, not a study measuring actual laboratory contamination rates or proving what caused individual incidents.

What did the forensic DNA contamination survey find?

The researchers collected anonymous online responses from 100 forensic practitioners across laboratory, scene, quality and supervisory roles. Participants rated 12 potential human-factor risks on a five-point scale. The highest retained average ratings were:

• Workload: 4.58 out of 5
• Fatigue: 4.51 out of 5
• Time pressure: 4.46 out of 5
• Improper glove changes: 4.42 out of 5
• Non-compliance with personal protective equipment: 4.39 out of 5
• Interruptions and distractions: 4.31 out of 5
• Communication failures: 4.25 out of 5
• Staffing shortages: 4.20 out of 5

These figures describe perceived risk, not the probability that contamination will occur. The researchers did not test whether the differences between these average scores were statistically significant.

Why the reported incidents and near-misses need context

Sixty-two respondents said they had witnessed or been involved in a DNA contamination incident, while 81 reported observing a near-miss. Those percentages refer to the people who answered the questionnaire. They must not be presented as contamination prevalence rates across forensic laboratories, because the study did not independently verify the events or use a representative probability sample.

Among the 62 respondents who reported contamination-event experience, 29% selected workload as the main perceived contributor. Other frequently selected factors included PPE non-compliance (21%), communication failures (16.1%), improper glove changes (12.9%) and time pressure (11.3%). Again, these are respondent attributions, not experimentally established causes.

What does this mean for forensic DNA quality management?

Most laboratories already recognise physical contamination routes: contact between exhibits, shared equipment, glove-mediated transfer, movement between work areas and inadequate decontamination. The new survey draws attention to the working conditions in which those controls are implemented.

A procedure may require a glove change, a cleaned bench, a documented handover or a second review. Under heavy case loads and frequent interruptions, the question becomes whether staff have sufficient time, space and support to carry out those requirements consistently.

This is especially relevant when interpreting low-template and touch DNA. A sensitive analytical system may detect small amounts of DNA, but the resulting profile does not establish how that DNA arrived on an item. For background on this distinction, see Simply Forensic’s DNA contamination control guide and DNA transfer and activity-level interpretation overview.

Five practical questions for laboratory managers

1. Are case volumes and staffing levels reviewed as quality risks? A backlog is an operational issue, but it can also affect the time available for contamination-prevention steps.
2. Are glove changes and workspace transitions observable and auditable? Training records alone do not show how consistently procedures are followed during busy shifts.
3. Can personnel report near-misses without discouragement? Near-miss reports can reveal vulnerable processes before evidenceEvidence is any form of proof, such as objects, materials, or scientific findings, presented to establish or disprove a fact in a legal proceeding. It is used to reconstruct events and link or exclude individuals Read Full Definition is affected.
4. Are interruptions, handovers and shared-workspace practices considered during root-cause analysis? A single procedural deviation may have several contributing conditions.
5. Do corrective actions address system conditions as well as individual behaviour? Retraining may be appropriate, but it is not necessarily sufficient when workflow design or workload is involved.

These are practical review prompts inspired by the findings, not a validated checklist produced by the study. They should be considered alongside applicable accreditationAccreditation – a process by which a laboratory must prove to an accrediting agency that their processes, equipment, and employees are competent, credible, and accurate. The accrediting agency will inspect the laboratory and observe its Read Full Definition requirements, laboratory SOPs and contamination-control standards.

Important limitations of the new research

The authors acknowledge several limitations. Recruitment used professional networks and an anonymous convenience sample, so the results cannot be generalized to all forensic practitioners. Professional credentials were self-reported. The questionnaire was exploratory and was not formally psychometrically validated. Some respondent-level records were unavailable for further analysis, and no inferential tests were performed to establish causal relationships.

The authors also propose a Human-Factor DNA Contamination Framework grouping individual, organizational, environmental and behavioural considerations. They explicitly describe it as conceptual, non-predictive and not yet validated. It should not be used as a numerical risk score or treated as proof that a particular factor caused contamination.

Why this October 2026 paper matters

The study does not overturn established DNA contamination precautions. Its contribution is to highlight practitioner perceptions of the organisational and human conditions that may influence how those precautions work in practice. For laboratories managing growing caseloads and increasingly sensitive DNA methods, it offers useful questions for quality review and a basis for further empirical research.

Primary source

Alketbi, S. K., & Ahmed, F. S. (2026). Practitioner perceptions of human factors contributing to DNA contamination risk in forensic practice: a cross-sectional survey. Bulletin of the National Research Centre, 50, Article 123. Published online October 14, 2026. Read the open-access study (DOI: 10.1186/s42269-026-01510-y).