Which type of evidence can be analyzed to determine the presence of DNA?

The presence of DNA can be effectively analyzed from hair and bodily fluids because these substances contain cellular material that is rich in genetic information. Hair, particularly when it still has roots or follicles attached, can hold DNA, allowing for individual identification when processed correctly in a forensic laboratory. Similarly, bodily fluids such as blood, saliva, semen, and urine are excellent sources of DNA, as they contain a significant number of cells that have DNA. These sources can be used to match suspects to a crime scene, establish paternity, or identify individuals involved in investigations.

Soil samples and fire residue do not typically contain human DNA or sufficient cellular material for analysis. While scratches on a surface may indicate physical evidence, they do not inherently provide biological material necessary for DNA testing. Thus, hair and bodily fluids remain the primary sources for DNA analysis in forensic investigations.