In his first interview since announcing Officer Darren Wilson would not be indicted in the shooting of Mike Brown, St. Louis County Prosecutor Bob McCulloch told radio station KTRS that he allowed witnesses he knew were lying to testify to the grand jury.

Later in the interview, McCulloch said he would not charge any of the witnesses he said “absolutely lied under oath” with perjury.

McElroy's version matched Wilson's account, which had already been reported by the time she spoke to investigators on Sept. 11, four weeks after the incident.

The Smoking Gun reported that McElroy lied to the grand jury, telling them she watched while smoking a cigarette on the sidewalk as Brown got shot and he never had his hands up.

McCulloch’s description of the woman who “clearly wasn’t present” and parroted Wilson’s statement from a newspaper aligns with the account of “Witness 40,” Sandra McElroy.

McCulloch’s acknowledgment that he knew some of the witness accounts were untrue raises ethical questions about his office’s presentation to the grand jury.

According to Missouri Rules of Professional Conduct, RULE 4-3.3, "A lawyer shall not knowingly offer evidence that the lawyer knows to be false."

The law also says that a lawyer "may refuse to offer evidence, other than the testimony of a defendant in a criminal matter, that the lawyer reasonably believes is false."

"A lawyer should not present testimony that he believes to be false," Steven Lubet, a law professor at Northwestern University, told BuzzFeed News. "That is especially true in a proceeding that lacks all of the usual safeguards, such as opposing counsel and a judge."

On the issue of possible perjury charges, Columbia Law Professor Jeffrey Fagan told BuzzFeed News that "if a witness perjures herself, the prosecutor does have the discretion, and perhaps a legal obligation, to prosecute for perjury."

There is no evidence in the documents released by the St. Louis County prosecutor's office after the grand jury decision that McCulloch or anyone from his office ever told the jurors to regard any specific witness statements as less credible than others.

As McCulloch said in the interview, it was his office's priority to put everything — true or not — in front of the grand jury and let members make their own determination.