Which type of search requires probable cause to obtain a search warrant?

The requirement for probable cause to obtain a search warrant primarily applies to searches conducted for criminal evidence. In the context of law, probable cause refers to the reasonable belief, based on facts or evidence, that a crime has been committed and that the evidence sought will be found in the place to be searched. This standard is established under the Fourth Amendment of the U.S. Constitution, which protects citizens from unreasonable searches and seizures.

When law enforcement officials seek a warrant to search for evidence of criminal activity, they must demonstrate to a judge or magistrate that there is a fair probability that evidence of a crime will be found in the specified location. This ensures that searches are not conducted arbitrarily and protect the individual's right to privacy.

In contrast, searches for administrative purposes or those conducted by administrative agencies may have different standards, often allowing for less stringent requirements than probable cause. Searches performed using aerial photography typically do not require a warrant either, as long as they do not invade a reasonable expectation of privacy. Therefore, the nature of the search distinctly characterizes the standard required for obtaining a warrant.