06/07/2026
๐๐ข๐ ๐๐๐ก๐๐ ๐๐ก๐ ๐๐ก๐๐๐ซ ๐ฆ๐ฌ๐ฆ๐ง๐๐ (๐๐ข๐๐๐ฆ):
๐๐ผ๐ ๐ฎ ๐ณ๐ฒ๐ ๐ถ๐ป๐๐ถ๐๐ถ๐ฏ๐น๐ฒ ๐ฐ๐ฒ๐น๐น๐ ๐ฐ๐ฎ๐ป ๐ฟ๐ฒ๐๐ฒ๐ฎ๐น ๐๐ต๐ฒ ๐๐ฟ๐๐๐ต
A crime scene is often silent. There may be no eyewitnesses, no fingerprints, and no obvious clues. Yet a tiny drop of blood, a strand of hair with its root, or even a few skin cells left behind can tell an extraordinary story.
Hidden inside those cells is DNAโa molecular record unique to almost every individual. But comparing an entire human genome for every investigation would be far too slow and computationally expensive. Scientists needed a faster approach. That solution became the Combined DNA Index System (CODIS).
๐งฌ ๐ ๐ด๐ฒ๐ป๐ฒ๐๐ถ๐ฐ ๐ณ๐ถ๐ป๐ด๐ฒ๐ฟ๐ฝ๐ฟ๐ถ๐ป๐, ๐ป๐ผ๐ ๐ฎ ๐๐ต๐ผ๐น๐ฒ ๐ด๐ฒ๐ป๐ผ๐บ๐ฒ
Instead of reading an entire genome, CODIS examines 20 standardized genetic markers (19 STR loci and the Amelogenin marker). The combination of these markers forms a DNA profile that is extraordinarily unlikely to be shared by two unrelated individualsโmaking it as unique as a fingerprint, but written in DNA.
๐งช ๐๐ผ๐ ๐ฎ ๐ณ๐ฒ๐ ๐ฐ๐ฒ๐น๐น๐ ๐ฏ๐ฒ๐ฐ๐ผ๐บ๐ฒ ๐ฒ๐๐ถ๐ฑ๐ฒ๐ป๐ฐ๐ฒ
From a tiny biological sample to a database match, the process follows five key steps:
1. DNA is extracted from blood, saliva, hair roots, or other biological evidence.
2. The CODIS genetic markers are amplified using PCR.
3. Capillary electrophoresis determines the allele pattern at each marker.
4. These patterns are converted into a numerical DNA profile.
5. The profile is searched against millions of records in CODIS to identify potential matches.
โ
๐ช๐ต๐ฒ๐ป ๐๐ฐ๐ถ๐ฒ๐ป๐ฐ๐ฒ ๐ฏ๐ฟ๐ถ๐ป๐ด๐ ๐ฐ๐น๐ผ๐๐๐ฟ๐ฒ
CODIS is best known for solving criminal cases, but its impact extends far beyond the courtroom. It helps identify missing persons, reunite families, identify disaster victims, and has even cleared innocent people who were wrongly convicted years earlier.
โ ๏ธ ๐ก๐ผ๐ ๐ฒ๐๐ฒ๐ฟ๐ ๐๐๐ผ๐ฟ๐ ๐ฒ๐ป๐ฑ๐ ๐๐ถ๐๐ต ๐ฎ ๐บ๐ฎ๐๐ฐ๐ต
A DNA profile can only identify some
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