The service providers mandated with handling human specimen for DNA profiling need to be well versed in identification, collection, transportation and storage procedures for managing the evidence. This evidence must have been identified and collected from the crime scene or otherwise it may be contaminated or depleted. To facilitate the sample s collection, the victim is encouraged not to take a shower and the samples later obtained from clothes or body part after the assault. Evidences that can be traced on clothing include skin cells, saliva and semen.
These samples may also be traced from under the fingernails, in the vagina, mouth or anus. The physician or nurse examiner is mandated with the authority of collecting evidence on or in a person’s body. An immediate medical examination needs to be collected after the incident to address any injuries, obtain forensic evidence and treat sexually transmissible diseases. The body part that could have come into contact with the assailant such as anus, vagina and mouth are examined from where sample are obtained to also act as a control standard. In case hair analysis is deemed necessary, pubic hair or head hair can be obtained.
A control standard is used for comparison with other sample which was collected at the scene to identify the possible assailants. DNA evidence is a highly sensitive evidence and criminal; laboratories need to be consulted in cases of procedural questions (Berger, 2001). Application of CODIS to address crime CODIS applies two indexes to realize evidence which will aid in the investigation. Forensic index entails DNA profiles are composed of biological samples obtained at the scene of crime while offender index consists of DNA profiles of persons convicted of crimes involving violence.
DNA database legislation exists in every state which elucidates the cases which attract DNA profiling of offenders which should be entered into CODIS. There are states which require DNA profiles from all felonies to be entered within the databases of local forensic laboratories and federal state laboratories to address occurring crimes (National Commission on the Future of DNA Evidence, n. d). Identifying DNA evidence According to National Commission on the Future of DNA Evidence (n. d), few cells are required in the DNA sample to be subjected to analysis.
The table below is a summary of the positions with the victim’s body or crime scene from which vital evidence can be obtained. Even in cases of poor visibility of the stain, enough cells could be found for DNA typing. DNA does not merely locate the source of the sample but also places a known person at a crime scene or a place where they are suspected to have been. Service provider such as nurses, physicians etc need to be well versed with identification, collection and evidence preservation skills to make the tool more effective and efficient.