Today, Explained A police sketch based on DNA
Oct 25, 2022
Taylor Lambert, an investigative producer for CBC Edmonton, and Dan Crane, a biology professor at Wright State University and DNA evidence expert, discuss a controversial police sketch created from DNA phenotyping. They dive into the ethical dilemmas of using this technology, particularly regarding accuracy and racial profiling. The pair highlights public backlash and the challenges that arise from blending forensic innovation with ethical responsibility. Additionally, they explore the history of DNA phenotyping and its potential as a last-resort investigative tool.
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Edmonton Assault Case
- In 2019, a woman in Edmonton was violently sexually assaulted by a stranger.
- Police had minimal identifying details: height, accent, and race.
DNA Phenotyping Limitations
- DNA phenotyping is controversial; DNA holds building blocks, not a precise blueprint.
- Predicting simple traits like hair color is easier than complex ones like facial structure.
Parabon's DNA Snapshot Accuracy
- Parabon's DNA mugshots show varying accuracy, some close, others far off.
- The reliability is questionable, potentially less than eyewitness sketches.