The student performed a DNA fingerprinting lab to analyze DNA samples from suspects and a victim's DNA sample to identify a suspect. The student extracted DNA from samples, separated the DNA strands of different sizes using electrophoresis, and compared the separated DNA strands to the victim's sample, finding that suspect 3's DNA matched the victim's DNA. The lab was an interactive learning experience that used electrophoresis to separate DNA strands by size, with larger strands traveling shorter distances than smaller strands during the process.