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Advanced Methods for Collecting and Testing Serological and DNA Evidence in Sexual Assault Cases


As a professional who works with children who have been victims of abuse and exploitation, it is important to understand the various methods for collecting and testing serological and DNA evidence in sexual assault cases. Sexual assault cases are often complex and challenging to investigate, making it crucial to use the most advanced and reliable methods for collecting evidence.

The traditional method of collecting DNA evidence involves using a sterile swab to collect samples from the victim's body. However, this method is limited by the fact that it can only identify the perpetrator if they have left their DNA behind. This is not always the case, especially if the perpetrator uses a condom or if the assault took place in a public area where other people's DNA may be present.

To address this issue, investigators now use alternative methods for collecting and testing evidence, such as touch DNA analysis. Touch DNA analysis involves collecting DNA samples from objects that the perpetrator may have touched during the assault, such as a doorknob or a bedsheet. This method can be highly effective in identifying the perpetrator, even if they did not leave any bodily fluids behind.

Another innovative method for collecting evidence in sexual assault cases is the use of forensic light sources. These sources emit specific wavelengths of light that can highlight biological fluids such as semen and saliva, which are often used to identify the perpetrator. Forensic light sources can also detect bruises and other injuries that may have been sustained during the assault.

In addition to these methods, investigators may also use serological evidence to identify the perpetrator. Serological evidence involves testing bodily fluids such as blood, semen, and saliva for genetic markers that can identify the perpetrator. This method can be highly effective in cases where there is no physical evidence or where the perpetrator has worn a condom.

It is important to note that collecting and testing evidence in sexual assault cases is a complex process that requires specialized training and expertise. It is crucial that investigators follow proper procedures to ensure that the evidence collected is admissible in court and can be used to identify the perpetrator.

The NCACIA has developed training for criminal investigators and prosecutors that further explains these advancements and other methods to provide experts in the field with the most up-to-date training available. Many of those methods cannot be listed here as to protect the integrity of ongoing criminal investigations and provide offenders with information that may afford them with an opportunity to change their tactics to accommodate for these investigative techniques.

In conclusion, the use of advanced and innovative methods for collecting and testing serological and DNA evidence in sexual assault cases can significantly improve the chances of identifying the perpetrator. These methods are highly effective in cases where traditional methods may not yield results. By staying up-to-date with the latest forensic techniques and procedures, investigators can ensure that justice is served for victims of sexual assault.

However, it is important to also acknowledge that the process of collecting and testing evidence should be conducted by trained professionals. It is also essential to approach these cases with sensitivity and compassion and to prioritize the well-being of the victim throughout the investigation process.


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