Unraveling genetic evidence

Delve into the intricate world of forensic DNA analysis, where science meets justice. This page explores the key steps in analyzing DNA evidence, from profiling to database comparisons, providing insights into how individual identities are established from biological samples. 

DNA Profiling 

Once DNA evidence is collected, it is sent to a forensic laboratory where scientists create a DNA profile. This process is often called DNA fingerprinting because the resulting profile is unique to an individual. Scientists examine specific regions of DNA that vary among people and use these differences to create a genetic pattern. The DNA profile is then recorded and compared to other samples. DNA profiling revolutionized forensic science because it provided investigators with a scientific method of identifying individuals with a level of accuracy that was previously impossible.

Comparing crime scene DNA to a suspect's DNA

After a DNA profile is created from crime scene evidence, it is compared to DNA samples collected from suspects. Scientists carefully analyze the genetic markers to determine whether they match. If a match is found, it strongly suggests that the suspect's DNA was present at the crime scene. If no match exists, investigators can often eliminate that person from the investigation. This process helps ensure that innocent people are not wrongly accused and allows police to focus their efforts on finding the actual offender.

DNA Databases

DNA databases are collections of DNA profiles maintained by law enforcement agencies. In Canada, the National DNA Data Bank stores DNA profiles from convicted offenders and crime scene evidence. Investigators can compare DNA collected during an investigation to profiles stored in the database to identify suspects or connect crimes committed by the same person. DNA databases have helped solve thousands of criminal cases and have proven especially useful in identifying serial offenders and solving cold cases that remained unsolved for many years.

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