Grand juries cannot always be depended on to do precisely what some folks want them to do.

Take the case of a Harris County panel that had been impaneled to investigate Planned Parenthood’s activities. The district attorney launched the investigation at the urging of state officials — starting with Lt. Gov. Dan Patrick — into whether Planned Parenthood “sold fetal body parts” in violation of state law.

Today, the grand jury cleared Planned Parenthood of wrongdoing — and instead indicted two anti-abortion activists on charges of “tampering with government records.”

It was a serious surprise.

Here is part of how the Texas Tribune reported the story today:

“The indictments — part of the county prosecutor’s investigation into allegations that Planned Parenthood was illegally selling fetal tissue — include charges against anti-abortion activists David Daleiden and Sandra Merritt for tampering with a governmental record, a second-degree felony that carries a punishment of up to 20 years in prison. The grand jury handed down a second charge for Daleiden for ‘Prohibition of the Purchase and Sale of Human Organs,’ according to the Harris County District Attorney’s office. That charge is a class A misdemeanor that carries a punishment of up to a year in jail.

“The grand jury cleared Planned Parenthood Gulf Coast in Houston of breaking any laws.”

Planned Parenthood has become a whipping child for foes in Congress — and some Republican presidential candidates — over a heavily edited video that purported showing staffers talking about selling organs from babies.

Planned Parenthood, with a mission that goes far beyond assisting women who want to terminate their pregnancies, sees this no-bill from the grand jury as a significant victory in this public-relations campaign being waged against it by political adversaries.

Will this end calls to defund the organization? Probably not. It’s possible that we’ll hear complaints from those who consider this some kind of “political decision.”

Grand jurors lock themselves behind closed doors, listen to presentations by prosecutors and other witnesses. They are charged with weighing the evidence dispassionately and then deliver a decision based solely on what they hear in that room.

Unless I hear otherwise — and grand jurors are sworn to secrecy about what they say and hear during the presentation of evidence — I’ll presume the grand jury did its job properly.