Legal Question in Constitutional Law in California

Re: Search warrants

The police can begin investigating a second person based upon evidence they see while executing a search warrant in another investigation.

A warrant limits where police can search and what they can seize, but it doesn't limit what they can do with information they learn during the search.

In most jurisdictions, this is true even if the warrant is invalid or if it was not properly executed. An improper search of someone's home is an invasion of his or her rights but is not considered an invasion of the rights of third persons whose crimes may be revealed by the search.