Biological Traces Law and Legal Definition

Biological traces are samples collected for the purpose of investigation. Biological traces are collected not only from the scene of crime and a deceased person, but also from surviving victims and suspects. DNA can be extracted from any of the samples and used for comparative analysis. Biological traces, investigated by forensic scientists come from bloodstains, saliva samples (from cigarette buts or chewing gum), semen, excretion products and tissue samples, such as skin, nails, teeth, bone or hair. Samples are processed to isolate the DNA and to establish the origin of the samples.