The evidentiary threshold in the impeachment trial

Beyond the farcical drama, the impeachment trial of Vice President Sara Duterte raises an important question: What is the evidentiary threshold to convict an impeached official? The answer matters because impeachment is neither a criminal prosecution nor a civil action. This distinction is particularly important because public debate can easily confuse three different standards of proof: preponderance of evidence, clear and convincing evidence, and proof beyond reasonable doubt.

The lowest of the three is preponderance of evidence. This is the standard in civil cases. A party satisfies this burden when the evidence supporting his or her position has greater weight than the evidence on the opposing side. Preponderance therefore involves a balancing exercise. It does not require the court to reach a firm conviction or moral certainty. It merely requires the evidentiary balance to tip in favor of the party bearing the burden.

That standard, however, is too low to be casually imported into an impeachment proceeding. It affects an office created directly by the Constitution. Some impeachable officials are supported by a national electoral mandate. Therefore, a finding that the Vice President committed an impeachable offense requires something more substantial than simply concluding that the prosecution’s evidence is slightly more probable than the respondent’s evidence.

At the other extreme is proof beyond reasonable doubt, the standard applicable to criminal prosecutions. This does not mean absolute or mathematical certainty. Jurisprudence describes the standard in terms of moral certainty—that degree of proof that produces conviction in an unprejudiced mind. This standard is deliberately demanding because the consequences of criminal conviction can include imprisonment and, in some cases, loss of life.

But an impeachment trial is not a criminal prosecution. The penalty is limited only to removal from office and disqualification from holding public office. The Constitution separately provides that an impeached official remains liable to prosecution and punishment according to law. Thus, an impeachment conviction does not itself constitute a criminal conviction. This is why proof beyond reasonable doubt should not simply be transplanted to the impeachment trial.

The appropriate middle ground is clear and convincing evidence. This requires substantially more than a mere preponderance but less than proof beyond reasonable doubt. Jurisprudence has described clear and convincing evidence as evidence sufficiently strong to produce a firm belief regarding the truth of the proposition being established. This middle standard has particular relevance to impeachment because the proceeding has consequences more serious than an ordinary civil dispute but different from criminal punishment.

The fact that senators are politicians does not mean that an impeachment vote is simply a political preference expressed through a formal proceeding. Once senators sit as an impeachment court, they assume a constitutional responsibility. They must distinguish between political disagreement and an impeachable offense. And this is not a mere technical distinction. The evidentiary threshold is a constitutional safeguard. They took an oath to be guided by it.

Sadly, senators in this impeachment trial have shown the inclination to decide according to their partisan loyalties. Thus, media now has a serious duty to fulfil. Instead of reporting who delivered the more compelling courtroom performance, it should help citizens understand the evidentiary architecture of the case. Doing this is particularly important in a trial already surrounded by intense political polarization. The current coverage is mainly about competing narratives and not about the relevance of the evidence presented. A shift towards evaluating evidence must happen if Filipinos are to fully comprehend what is happening in the impeachment trial.

More importantly, knowing and understanding the evidentiary standard provides a useful civic discipline. It can help Filipinos move away from blind acceptance of the prosecution and reflexive defense of the accused. It can lead citizens—and particularly the media—to follow the evidence from allegation, to fact, to inference, to legal conclusion. Whether this means the conviction or acquittal of Vice President Sara Duterte, the Constitution wins in the end.