From where can DNA be sourced in forensic investigations?

DNA can be sourced from a variety of materials in forensic investigations. While it is true that DNA is found in many biological materials, the assertion that if it comes out of the body, DNA is in it accurately captures the broad range of samples that can contain DNA.

Body fluids and tissues, such as saliva, sweat, urine, and various organ tissues, all contain DNA, making them viable sources for forensic analysis. Additionally, conditions such as shedding of skin cells or the presence of bodily fluids in various locations enable forensic investigators to collect DNA evidence even when the samples are not easily identifiable, providing a broader perspective on potential sources of DNA than those limited to blood or hair.

In contrast, focusing solely on blood or hair follicles does not encompass the full spectrum of sources available in forensic science. Thus, the understanding that DNA can be found in many materials that exit the body highlights the versatility and crucial nature of DNA evidence in forensic investigations.