My novel is set in London in 1861. Could the police search a man's hotel room, if they thought he might be a jewel thief? What about his person -- could they go through his pockets? This guy is a baronet, though a shady one, so he has some status.
Googling on 'search warrants' turns up tons of hits, none of them of the least bit use! I am reduced to reading Sherlock Holmes short stories, but Holmes was notoriously loosy-goosey about legalities.