Forensic Science / 法证鉴识

Forensic science / 法证鉴识 is the court-facing use of scientific and technical knowledge to collect, preserve, compare, and explain evidence. 121.极简法医鉴识手册：一切犯罪，皆有痕迹 makes the concept explicit by explaining that “forensic” points to a legal forum, not only to a medical examiner. A forensic pathologist is one participant inside a larger system of crime-scene investigators, laboratory specialists, toxicologists, entomologists, psychologists, botanists, firearms examiners, and expert witnesses.

The source’s main corrective is that forensic science is powerful but not magical. Locard’s Exchange Principle makes crime scenes trace-rich, but Trace Evidence Forensics still depends on sample quality, chain of custody, laboratory resources, expert interpretation, and adversarial legal testing. CSI Effect names the cultural problem created when television makes every case look solvable by spectacular lab evidence.

This page also gathers earlier wiki forensic branches. 50.开膛手杰克结案报告：女法医的争议之作 showed why old and contaminated evidence creates Contested Forensic Attribution. 93.聊聊头发：秃了，就会变强吗？ added Forensic Hair Evidence as a trace category with wrongful-conviction risk. 97.花粉症与人类：从尼安德特人（啊啾！）到空气净化器… added Palynology As Evidence as location and environmental trace evidence.

Key Claims

• Forensic science is an institutional evidence system, not a lone genius or single lab test.
• Evidence types vary in strength; DNA, fingerprints, bloodstains, hair, pollen, insects, toxicology, testimony, and psychological profiles answer different questions.
• The same trace can support a claim, weaken a claim, or remain ambiguous depending on collection, contamination, comparison data, and alternative explanations.
• Legal use matters: experts must explain methods under cross-examination, not only produce technical findings.
• Public confidence should be calibrated between cynicism and fantasy: forensic science can reveal truth, but it cannot remove uncertainty from every case.

Connections

• Locard’s Exchange Principle, Trace Evidence Forensics, and Scientific Sampling Discipline - material and methodological base.
• Modern Criminal Investigation Formation - institutional history.
• CSI Effect and Internet Moral Trial / 互联网审判 - distorted public expectations around evidence and judgment.
• Drowning Forensic Uncertainty, Forensic Death-Time Inference, Forensic Entomology, Bloodstain Pattern Analysis, and Forensic Toxicology - evidence subfields from source 121.
• Contested Forensic Attribution, Forensic Hair Evidence, and Palynology As Evidence - earlier wiki evidence branches.