Fibers are among the most common forms of trace evidence. Our fiber evidence analysis helps attorneys understand what fiber findings can and cannot prove, and whether a laboratory's conclusions are scientifically sound.
We review fiber identification, comparison and transfer evidence, explaining fiber types, dye characteristics and manufacturing variability in terms a court can rely on.
Common problems we're called in to solve
- A crime lab report associates fibers with a defendant and counsel needs an independent review.
- Fiber transfer or persistence is central to the timeline of events.
- A civil case depends on identifying the source material of a fiber found at a loss site.
- The statistical significance of a fiber 'match' has been overstated.
Our approach
- 1Review of lab notes, microscopy and instrumental data such as FTIR and microspectrophotometry.
- 2Assessment of how common the fiber type and color are in commerce.
- 3Independent analysis of evidence where access is permitted.
- 4Testimony explaining the limits of fiber associations.
Outcomes and benefits
- An accurate picture of the evidentiary weight of fiber findings.
- Identification of methodological gaps or overstatement.
- Clear, balanced testimony on transfer and persistence.
Serving Pleasant Hill and the Bay Area
We assist defense counsel, prosecutors and civil litigators across Contra Costa, Alameda and San Francisco counties, as well as attorneys throughout California.
Frequently asked questions
Can fibers be traced to a single garment?
Rarely with certainty. Most fibers are mass-produced, so analysis usually establishes consistency rather than a unique source. We explain this carefully.
What instruments are used in fiber analysis?
Common methods include polarized light microscopy, FTIR spectroscopy, microspectrophotometry and thermal analysis.
Do you take criminal defense matters?
Yes, along with civil and insurance matters where fiber identification is relevant.