SM's Autopsy (# 23-1011) dated 9/27/23, pgs 1-4, linked above. (Excludes anthropology and toxicology reports):
E. Postmortem toxicology of femoral trabecular bone identified butorphanol, butorphanol metabolites, azaperone, and medetomidine. (See toxicology reports). Ref Autopsy pg 1/4.
The right femoral head (femur fragment and femur head) is retained for toxicology testing prior to release for forensic anthropology examination. Ref Autopsy pg 3/4.
The skeletal remains are released to Dr. Diane France for forensic anthropology examination on 10/3/23 and returned to El Paso County Coroner's Office on 12/27/23. Ref Autopsy pg 4/4.
On 1/17/24, the femurs are sectioned at the proximal and distal metaphyses for toxicology and DNA samples (right femur proximal, right femur distal, left femur proximal, left femur distal).
Distal femurs (right femur distal and left femur distal) are released to CBI on 1/22/24 for DNA testing, returned to El Paso County Coroner's Office on 4/3/24, and re-released to CBI on 4/5/24.
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Forensic toxicology using bone samples, such as femur fragments and femoral heads, is a specialized, highly sensitive method used to detect drug intoxication in cases of advanced decomposition, skeletonization, or when traditional fluids (blood, urine) are unavailable. Bone marrow, particularly in the femur, acts as a reservoir for certain drugs.
Recent investigations have highlighted the ability to detect specialized drug compounds, including wildlife sedatives like
butorphanol, within bone marrow.
Forensic Analysis of Femur Samples for Drug Detection:
- Sample Type: The femur is an ideal specimen due to its density, size, and the presence of significant marrow. The femur head and surrounding marrow can contain high concentrations of substances, sometimes higher than blood in postmortem studies.
- Preparation Method: Bones are cleaned of soft tissue, and the bone marrow is extracted. The sample is typically ground into a fine powder and subjected to solvent extraction (e.g., using methanol).
- Analytical Techniques: High-sensitivity instruments, such as liquid chromatography-tandem mass spectrometry (LC-MS/MS) or gas chromatography-mass spectrometry (GC-MS), are used to detect and quantify trace levels of analytes (often at picogram per gram levels).
Detecting Butorphanol Intoxication: Butorphanol is a synthetic opioid agonist-antagonist that is heavily metabolized in the liver.
- Evidence in Bones: In cases of suspicious death, toxicological analysis has identified butorphanol—along with companions like medetomidine and azaperone (together known as "BAM")—within the bone marrow.
- Metabolites: While butorphanol is metabolized to hydroxybutorphanol and norbutorphanol, forensic analysis in bone targets both the parent drug and metabolites for detection.
- Interpretation: While bone analysis can prove exposure to the drug, it is challenging to definitively determine the exact time of ingestion or correlate the concentration directly with an acute fatal dose, making context from a full autopsy necessary.
Advantages and Limitations
- Advantages: Bone provides a stable environment, protecting drugs from rapid degradation.
- Limitations: Standardization is difficult, as drug concentration in bones can be affected by the burial environment, soil pH, and moisture. Additionally, not all drugs detected in blood are equally detectable in bone, requiring advanced, specialized laboratory protocols.
Blood analysis is the golden standard in the field of forensic toxicology. However, when extended decomposition of the remains has occurred, alternati…
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