Which of the following is a common first step in the investigation of a sexual assault case?

In the investigation of a sexual assault case, a common first step is documenting the victim's injuries. This is crucial as it provides immediate physical evidence that can be critical in establishing the nature and severity of the assault. Detailed documentation, including photographs and descriptions of injuries, helps build a comprehensive record for law enforcement and can be pivotal in both the criminal investigation and any subsequent legal proceedings. Properly documenting injuries also assists in understanding the dynamics of the assault, including potential indications of force or coercion.

While interviewing the suspect, conducting background checks, and assessing witness reliability are all important components of a complete investigation, they typically occur after establishing the initial facts through careful documentation of the victim's experience and any potential evidence present at the scene. By focusing first on the victim's condition and the physical evidence, investigators can build a stronger case that supports the credibility of the victim's account.