I started to read Alderman v. US after Forrest said that 4th Amendment rights cannot be vicariously asserted. I'm a little unclear on how this works. Could an investigator warrentlessly burgle the residences of two conspirators A & B, and use evidence found in B's place against A and evidence found in A's place against B, all without violating the fourth amendment? How about email accounts? If so, why don't investigations against known conspirators proceed this way all the time?