Special counsel Robert Mueller (L) arrives at the U.S. Capitol for closed meeting with members of the Senate Judiciary Committee June 21, 2017 in Washington, DC. Alex Wong Getty Images

Washington is all abuzz that Special Counsel Robert Mueller has empaneled a grand jury in furtherance of his investigation into whether or not Donald Trump's campaign colluded with Russia. In spite of the inevitable speculation this creates, its worth remembering that a grand jury is a powerful investigative tool, but not a criminal charge. So what is the significance of a grand jury convening?

A grand jury has the power to subpoena both witnesses and documents, such as bank records and phone records. Refusal to comply with a subpoena, which has the force of a court order, without a legal basis creates the risk of the subpoena recipient being held in contempt of court and subject to criminal or civil penalties.

Legal privileges, such as the Fifth Amendment privilege against self-incrimination, are a basis for a witness to refuse to testify. The only way to get around a legally applicable privilege would be to seek an order of immunity, which would protect the witness from criminal exposure and therefore render the Fifth Amendment inapplicable. Perhaps the most famous immunized witness in past independent counsel investigations is Monica Lewinsky; its easy to forget that former national security advisor Michael Flynns lawyer offered his testimony to the Senate Intelligence Committee if he received immunity, where anything said could not be used against him in a criminal proceeding. The Committee, perhaps anticipating a prosecutors eventual interest in Flynn, declined.

Moreover, certain evidence, such asyes, Mr. Presidenttax returns, are considered more private than others, and cannot be obtained via subpoena. Rather, Mueller would need to seek an order from a judge to obtain Trumps tax returns, a wiretap, or a pen register, for instance.

Unlike Congressional hearings, in which sworn testimony is public, grand jury investigations are secret by law. This secrecy rule is demonstrated by the fact that Muellers grand jury has apparently been working for several weeks, but was only reported in the media yesterday. Prosecutors, law enforcement, and grand jury members themselves are barred from discussing grand jury proceedings. The reasons for this are twofold: First, publicity can cripple an ongoing covert investigation; second, grand jury investigations are secret to protect subjects of an investigation who may or may not ultimately be charged.

Grand jury witnesses, however, are not subject to the secrecy rules. So any legal reports from the grand jury room will come from the witnesses.

Grand juries, like Congress, can issue subpoenas. Unlike Congress, they can vote to criminally indict the subjects of their investigations. The purpose of empaneling a grand jury is to gather and assess the weight of the evidence. It does not mean that there exists enough evidence to amount to proof beyond a reasonable doubt, which is the standard for a conviction, or probable cause, which is the standard the grand jury must find in order to vote to indict. Given the grand jury secrecy rules described above, there is no way for the public to know with certainty how much evidence Mueller has amassed, or its value in a criminal case. So the smart money wont bet on criminal charges by the mere fact of empanelment alone.

In summary, empaneling a grand jury is consistent with Muellers reputation as a lawyer and investigator: a meticulous and thorough officer of the court who is committed to accuracy and the rule of law. But the grand jurys existence doesnt amount to a criminal charge, and it definitely doesnt equate a criminal conviction. As were whipsawed by Washington, its worth taking a page from Muellers book, and following the evidence where it leads.

Juliet S. Sorensen is a clinical associate professor of law at Northwestern Pritzker School of Law. She is the co-author of Public Corruption and the Law: Cases and Materials (West Academic 2017).

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Why Robert Mueller's Grand Jury Isn't Really a Big Deal - Fortune