Which of the following is critical to maintain the integrity of evidence in a sexual assault case?

Maintaining the integrity of evidence in a sexual assault case is crucial for ensuring that a thorough and accurate investigation can take place. The choice indicating that patients should not shower before an examination is particularly significant because showering or washing can eliminate vital physical evidence, such as bodily fluids, hair, or other trace materials that could be useful in corroborating a victim's account of the assault.

The preservation of this evidence can play a key role in the collection of forensic samples, which can then be analyzed for DNA or other materials relevant to the case. Protecting this evidence from being altered or destroyed is essential for the legal process to proceed effectively.

Other actions, while important in the overall response to a sexual assault, focus more on the support aspect or the legal reporting aspect rather than directly ensuring the physical evidence remains untainted.