>"The request of the police is nutty and indicative of not understanding the technology. Unless the murdered woman yelled out "Alexa {pause a little bit for wakeword recognition} Heeelp, my husband is killing me, call the police" or the husband asked "Alexa, how do I clean a bloody hottub", nothing material will be discovered."

The police often check search histories in murder investigations. Do you also suppose that is only useful if the victim googled "Help, my husband is murdering me!" ?

Maybe you should leave the policing to the police.