What we know about the investigation into the Supreme Court leak

Roberts called the release "a singular and egregious breach" of trust and said he's "directed the Marshal of the Court to launch an investigation into the source of the leak."
Here's what we know about the investigation:When was the draft opinion published and what does it say?
The draft opinion was published Monday evening by Politico and was later authenticated by the court.
"Court employees have an exemplary and important tradition of respecting the confidentiality of the judicial process and upholding the trust of the Court."
"I have directed the Marshal of the Court to launch an investigation into the source of the leak," he said.
Who is the marshal of the Supreme Court?
The marshal of the Supreme Court oversees about 260 employees, including the court's police department, which has the power to arrest people on the grounds of the court.
It's unclear what investigative resources the court's marshal has and how much experience employees have in finding the source of a leak.
If the marshal finds evidence of a possible crime, the court can ask the Justice Department to prosecute someone.
Why didn't Roberts ask the Justice Department to investigate the leak?
"Leaks of government information, by themselves, are not crimes," said Steve Vladeck, a CNN Supreme Court analyst who's a professor at the University of Texas School of Law.
Former clerks speak outFormer Supreme Court clerks were stumped as to how such a probe would unfold, including whether the investigators have the power to issue subpoenas.