Which workflow principle helps prevent cross-contamination by limiting movement through the scene?

Which workflow principle helps prevent cross-contamination by limiting movement through the scene?

• A. One-way workflow
• B. Two-way workflow
• C. Circular workflow
• D. Random workflow

Answer: (A)

Limiting movement through a scene to a single, forward direction prevents contaminants from moving from dirty areas into clean areas. This unidirectional workflow directs investigators to start in the cleanest zones, don PPE, and progress toward the more contaminated areas without reversing course. By keeping a planned route and maintaining distinct zones (clean, buffer, hot) and dedicated or decontaminated equipment as you advance, the risk of cross-contamination drops and the integrity of evidence is preserved. Back-and-forth or looping movement can drag fibers, dust, or biological material into places that should remain uncontaminated, and it makes it harder to document the true locations and conditions of evidence. Other movement patterns either encourage backtracking or chaotic flow, which increases the chance of transferring contaminants and disturbing evidence.

Limiting movement through a scene to a single, forward direction prevents contaminants from moving from dirty areas into clean areas. This unidirectional workflow directs investigators to start in the cleanest zones, don PPE, and progress toward the more contaminated areas without reversing course. By keeping a planned route and maintaining distinct zones (clean, buffer, hot) and dedicated or decontaminated equipment as you advance, the risk of cross-contamination drops and the integrity of evidence is preserved. Back-and-forth or looping movement can drag fibers, dust, or biological material into places that should remain uncontaminated, and it makes it harder to document the true locations and conditions of evidence.

Other movement patterns either encourage backtracking or chaotic flow, which increases the chance of transferring contaminants and disturbing evidence.