Visual appearance and chemical composition answer different questions.
What the supplied paper shows
A CDC report on fentanyl-involved deaths during 2019–2020 described illicit fentanyl appearing in counterfeit pills resembling prescription medicines, including alprazolam. Classification drew on toxicology, scene information and witness evidence.
Limits of interpretation
This historical surveillance report does not establish the contents of a particular pill or current local prevalence. Some classification required assumptions, and participating jurisdictions did not represent every location equally.
Implications for case review
In a forensic report, distinguish a reported pill name, imprint, laboratory identification and detected biological exposure. A person’s expectation about a tablet cannot establish what it contained. Conversely, fentanyl detection alone does not identify which item supplied it. Preserve tablets and packaging where available, and integrate laboratory evidence with timing and the clinical course rather than assigning identity from appearance.
Source and related reading
Source: PMC8675656, supplied full-text paper. Findings are paraphrased; the forensic discussion is an interpretation.