The forensic scientist often appears in court to present and interpret scientific findings. The identity and weight of the drug contribute to prosecution and sentencing. Technicians draw inferences about the dose and the time and route of ingestion. This information helps the forensic pathologist to determine what events caused or contributed to the victim's death. DNA also is used to reexamine evidence in previously unsolved crimes.
Genetic markers contained in the stain help identify the perpetrator.
All police officers who perform breath testing, as well as the instruments they use, must be certified regularly to assure accuracy. The task of the forensic scientist is daunting. The scientist requires the technical expertise to accurately and precisely analyze evidence. An error can be devastating. It may result in the conviction of the innocent or exoneration of the guilty.