DNA profiling is a forensic technique in criminal investigations, comparing criminal suspects' profiles to DNA evidence so as to assess the likelihood of their involvement in the crime. It is also used in parentage testing, to establish immigration eligibility, and in genealogical and medical research. The DNA profile was used to identify the perpetrator. As technology advances, forensic scientists are able to analyze smaller and smaller biological samples to develop a DNA profile. ... In some jurisdictions, a DNA sample is routinely taken from an arrestee during the process of booking and fingerprinting.