Google is giving data to police based on search keywords, court docs show
Court records in an arson case show that Google gave away data on people who searched for a specific address.
This has as been going on before the internet was invented (libraries, mainly) and is one way the FBI, for just one agency, foils plots like the very recent one involving the Gov of Michigan. Not generally a bad thing, and arrests are not made on the basis of it, just inquiries.