The general rule, he says, is that if investigators see something of interest beyond the scope of the search warrant when they're looking at electronic files, they may need to go back to a judge and seek a new warrant.
"Consideration should be given to obtaining information from other sources or through the use of a subpoena, unless such efforts could compromise the criminal investigation or prosecution, or could result in the obstruction or destruction of evidence, or would otherwise be ineffective," the rules say.
Cohen, who has described himself as Trump’s “fix-it guy,” has been at the center of a controversy over a $130,000 payment he made to adult film star Stormy Daniels shortly before the November 2016 election.
No, the privilege only covers communications relating to legal advice, said Lisa Kern Griffin, a former federal prosecutor and a professor at Duke University School of Law. It does not protect a person’s discussion of business, personal, or financial matters with a lawyer if they are unrelated to a legal representation.