Law enforcement officers may need a search warrant to obtain which of the following?

In the context of law enforcement and the legal requirements surrounding searches and seizures, obtaining a search warrant is necessary when there is a reasonable expectation of privacy. A sexual assault examination typically involves sensitive bodily examinations and possibly the collection of physical evidence from the suspect's body. Given that this process intrudes upon the individual's privacy and personal autonomy, a search warrant is legally required to ensure that the examination is conducted lawfully and that the rights of the suspect are protected.

In contrast, consulting with a victim, interviewing witnesses, and accessing public records generally do not require a search warrant. These actions are part of standard investigative procedures that do not infringe on reasonable expectations of privacy in the same way that a physical examination does. Therefore, choice B is the correct answer as it reflects the need for a warrant due to the private nature of the examination involved.