Just dealing with the one you seem to put as most important - the 9th circuit's logic is watertight and police have to be able to investigate or a lot of murder

Just dealing with the one you seem to put as most important - the 9th circuit's logic is watertight and police have to be able to investigate or a lot of murders will go unsolved. You'd really need to provide a reason why the search was unreasonable to make a point with that one. It makes a lot of sense to have protections against the police searching phones, homes, businesses, etc. But assuming that those protections aren't at play then it is entirely reasonable that a policeperson can force someone to put their thumb somewhere. The police already have the power to manhandle and imprison people, forced thumblocation is nothing compared to that. What do you want the Supreme court to do here, officially rule that police can coerce not just entire bodies at once, but also thumbs separately and individually? That seems like an unnecessary call for them to make.