Transcript

DNA can be found in biological samples such as blood, saliva, hair, semen, and skin cells left at crime scenes or parties to a crime. These samples are collected using cotton swabs. To avoid contamination and DNA damage, the samples are collected following careful steps, including wearing gloves and using appropriate packaging. Additionally, each sample is labelled with detailed information about its origin and is kept at an appropriate temperature to prevent degradation. This process ensures that the DNA evidence remains intact for analysis in the laboratory.