In these cases, do they actually have evidence a search engine query was made? How do they decide which search engines to subpoena? Do they just subpoena multip

In these cases, do they actually have evidence a search engine query was made? How do they decide which search engines to subpoena? Do they just subpoena multiple search engines? To search your house for evidence, they must have reliable information showing probable cause of evidence specifically in your house, and not somewhere else. If they don't know where the evidence is, or what it is, they aren't allowed to do the search. But in the arson case, do they have evidence the suspect used Google in the course of the crime? If not, how do they have probable cause for the warrant?