A PRN employee then sometime “between March 25-31, 2015 deleted the Clinton archive mailbox from the PRN server.” The FBI reports that it had found a “PRN work ticket, which referenced a conference call among PRN, [Hillary attorney David] Kendall, and Mills on March 31, 2015.” The PRN employee was advised by an attorney “not to comment on the conversation with Kendall based upon the assertion of attorney-client privilege.”

What was said in those PRN conversations with Ms. Mills, Clinton aides and Mr. Kendall? Why the sudden Clinton rush to deal with a server that had been sitting quietly for so long? Usually, the FBI is keenly interested in any potential destruction of evidence—especially evidence under subpoena. Yet the FBI didn’t explore the details of the convenient archive deletions.

The FBI’s kid-glove treatment of Mrs. Clinton raises serious doubts about the seriousness of Mr. Comey’s probe. His July 5 public rebuke of her “extremely careless” handling of secrets has masked that Mrs. Clinton and her aides were given a pass on much of their behavior and dubious answers. The entire episode is another Jim Comey scar on the FBI’s reputation.