1. DNA profiling: DNA contains unique genetic information that is inherited from parents, making it a highly effective tool for identifying individuals. DNA profiling can be used to link suspects to crime scenes or to exclude innocent individuals from suspicion.
2. Fingerprints: Fingerprints are unique to each individual and remain consistent throughout a person's life. The patterns of ridges and valleys on a person's fingertips can be used to identify suspects or link evidence to a specific individual.
3. Facial recognition: Facial recognition technology uses unique features of a person's face, such as the size and shape of facial features, to identify individuals. This technology can be used to match suspects to surveillance footage or to identify individuals in large crowds.
4. Blood type: Blood type is determined by specific proteins on red blood cells, with different combinations of proteins resulting in different blood types (A, B, AB, O). Blood type can be used to exclude or include individuals as suspects based on blood found at a crime scene.
Four features of variation in humans that are used in crime detection
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