Could identical twins commit the perfect crime?

Veritasium examines the legal challenges posed by identical (monozygotic) twins in forensic science. Standard DNA profiling often fails to distinguish between identical twins because they originate from the same fertilized egg, which has led to cases where suspects were cleared due to reasonable doubt. However, the video clarifies that their DNA is not perfectly identical throughout their entire lives. Every time cells divide, rare, random copying errors can occur, leading to small differences in their genetic code across billions of base pairs. While identifying these differences via whole-genome sequencing is currently expensive and difficult, it represents the future of forensics in overcoming the twin-related limitations of standard DNA testing.