Final answer:
When handling delicate specimens during lab work, avoid marking them directly, use sketches or photos with a scale for size reference, and ensure they are returned to their proper location without disturbing existing labels.
Step-by-step explanation:
Avoid marking the fragile items of evidence themselves. While handling specimens in a lab, you should use photographs or sketches for documentation purposes and include a scale such as a ruler or coin for size reference. Remember not to disturb labels or numbers on specimens or boxes, as some materials are too delicate for direct marking and this also helps maintain organization for others. Always return specimens to their designated location to avoid confusion and maintain integrity during lab work.