Source: Veritasium
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THE TL;DW
- Standard forensic DNA testing can’t tell identical twins apart because their genomes are (almost) exactly the same, which has let real suspects walk free.
- The video walks through actual criminal cases where police had DNA evidence but couldn’t determine which twin left it at the scene.
- Scientists have developed workarounds — including hunting for rare random mutations or epigenetic differences between twins — but Veritasium explains why these fixes are still far from foolproof.
The Jupiter Take
This isn’t a hypothetical thought experiment — the “identical twins DNA match” loophole has genuinely derailed prosecutions in the past because standard testing can’t distinguish monozygotic siblings. Veritasium uses real cases to explain why courts have had to drop charges rather than risk convicting the wrong twin.
Context
Identical twins form from a single fertilized egg, so their DNA sequence is essentially the same, unlike regular siblings whose profiles differ enough for a near-certain match. This has caused real legal headaches: in one case,
