In the US, are Google queries about the law considered attorney-client privilege? What about library records? Browser history? Google Maps / Uber / car travel history (when traveling to an attorney's office)?
If somebody Googles "best attorney for murder NYC" a day after a murder is committed but before any case is filed against them (so they clearly had some reason to expect that case), could that be used as evidence?
I'm not sure if you were actually asking the question but regardless the answer is that all of those absolutely can and are regularly used as evidence
Hans Reisee rather infamously checked out a book from the library about how to kill someone and hide the evidence.