New York (VINNEWS/Rabbi Yair Hoffman)  The murder, or killing, happened in 2022.  The verdict was concluded in June of 2025. Almost a year ago. Was it the girlfriend?  Or was it the police officer’s friends? The controversy is still in the air – even one year later.

A jury in Dedham, Massachusetts cleared Karen Read of killing her boyfriend, Boston police officer John O’Keefe back on that snowy night in January in 2022.

The prosecution said it was murder on her part. Karen Read had struck Officer O’Keefe with her car during a blizzard and left him there to die in the snow.

The defense answered with doubt piled upon doubt.

Maybe the car never hit him at all. Maybe his injuries came from a dog and a beating that took place inside a house, not from a vehicle. Maybe the police investigation itself could not be trusted.

The lead investigator, State Trooper Michael Proctor, had texted friends that Read was a “whack job,” that he hoped she would harm herself, and that “all the powers that be want answers ASAP” — words that would later get him fired and permanently barred from law enforcement in Massachusetts.

Evidence was collected in red Solo cups and Stop & Shop grocery bags rather than proper containers, and the defense pointed to the close ties between Proctor and the very household where O’Keefe’s body was found, arguing those relationships had quietly shaped the entire investigation. No single one of these doubts had to be proven. Together they made it impossible for the jury to draw one clean, unbroken line to a verdict of guilty, and so Read walked free on the most serious charges.

The American courtroom rests on a quiet assumption that everyone takes for granted: doubt protects the accused. A single reasonable doubt is enough to acquit. Stack a second doubt on top of it and the case for conviction only weakens further.

My Roshei Yeshiva always emphasized to look at everything, even events that happen in the secular world, from Torah eyes. What does the Gemorah say about a similar case? What do the Gedolei HaRishonim and Acharonim say about the topic in general?  And so, let us explore the idea of doubts and how they function. What is their underlying method of functioning? What do they do?

The Torah’s system of doubt runs differently. Where there is a single doubt about a Torah prohibition, the rule is to be strict, not lenient. It is only when a second doubt is added — a sfek sfeika, a doubt of a doubt — that the result turns to leniency.

Why should one doubt bind us while two doubts set us free? The secular courtroom offers a hook and a contrast, but not an answer.

For the answer, in Torah law, as it pertains to, say, Kashrus, four distinct explanations have been offered across the centuries.  They reveal four very different ways of understanding what a double doubt – a sfek sfeikah – actually is.

Presented here in the order in which their authors lived, they open four ways of understanding the concept.

The First Approach — The Rashba (1235–1310): It Works Like a Majority

The earliest of the four explanations belongs to the Rashba, Rabbeinu Shlomo ben Aderet of Barcelona. He taught that a double doubt is even more powerful than a rov – simple majority. The reasoning is a matter of counting. When there is a double doubt, two reasons point toward permitting the item and only one reason points toward forbidding it. Two against one is a majority leaning toward leniency, and just as we ordinarily follow the majority, here too we follow the two permitting sides.

The Rashba explained that this is why every kind of prohibition can be permitted through a double doubt — even prohibitions that come directly from the Torah — because in the end the matter follows the majority of all the possibilities. Rabbeinu Peretz taught the very same idea: the entire reason a double doubt is lenient is that the permitting sides form a majority.

The Second Approach — The Shach (1621–1662): Two Independent Doubts

The next authority in order of lifetime is Rav Shabsai Kohen – the Shach. The Shach establishes a foundational requirement that a true double doubt only counts when the two doubts are genuinely independent — when one doubt concerns one matter and the second doubt concerns a completely separate matter, what he calls “one subject and one object” (inyan echad v’guf echad). Where the two supposed doubts are really about the same matter and the same object, they collapse into a single doubt, and the leniency of a sfek sfeika does not apply.

To declare an item forbidden, one would need a clean chain in which the first link is forbidden and the second link is also forbidden. But in a genuine double doubt, every path that begins on a forbidden footing meets a permitted footing before it reaches the end, and every path that remains forbidden at the end began as permitted. There is no route through both doubts that stays prohibited the whole way. On this way of understanding it, the leniency flows not from counting sides, and not from downgrading the question to a Rabbinic one, but from the very structure of two independent doubts: a prohibition needs an unbroken chain in order to stand, and two genuinely separate doubts ensure that no such chain can be built. This also explains precisely why the Shach insists the two doubts be in two different matters — two doubts about the same matter leave a single continuous question intact, while two doubts about two different matters block one another.

The Third Approach — The Pnei Yehoshua (1680–1756): The Second Doubt Is Only Rabbinic

The third explanation comes from Rabbeinu Yaakov Yehoshua Falk, the Pnei Yehoshua, building on the view of the Rambam, the Ramban, and the Ran. These authorities hold that the rule “when in doubt about a Torah law, be strict” is not itself a Torah law at all — it is only a Rabbinic safeguard. That changes everything.

The first doubt is a doubt about a Torah prohibition, so the Sages instruct us to be strict. But once a second doubt is added on top of it, the question is no longer a Torah-level question — it has become a doubt about a Rabbinic rule. And the established rule for a doubt about a Rabbinic matter is that we may be lenient. The double doubt is therefore permitted because the second layer of doubt converts the entire question into something only Rabbinic, where leniency is the norm.

The Fourth Approach — The Sha’arei Yosher (1860–1939): A Doubt About Whether There Is Even a Doubt

The most recent of the four explanations comes from Rav Shimon Shkop in his Sha’arei Yosher, and he arrived at it by examining the exact words the Sages chose. They did not say “a case with two doubts.” They specifically said “a doubt of a doubt.” That precise wording is the key.

According to Rav Shimon, the leniency does not come from piling up doubts until the permitting sides outnumber the forbidding side. The real point is that a double doubt means we are not even certain that a doubt of prohibition exists in the first place. The Sages told us to be strict only when a genuine, definite prohibition stands before us. They never told us to be strict when we are unsure whether any prohibition exists at all. In a single doubt, there is at least a real doubt about a real prohibition, so strictness can take hold. But in a double doubt we lack even that — we have only a doubt about whether a doubt exists — and so there is no foothold for strictness to begin with.

Four Lenses on One Principle

Seen side by side, the four approaches are strikingly different. The Rashba counts sides and follows the majority. The Shach locates the leniency in the requirement that the two doubts be genuinely independent, so that no unbroken chain of prohibition can form. The Pnei Yehoshua shows the question shrinking down to a Rabbinic matter, where leniency rules. And the Sha’arei Yosher argues that the strictness of “when in doubt, be strict” never applied here at all, because we cannot even be sure a doubt exists. One halachic outcome; four explanations.

A word of caution. The secular courtroom and the Beis Midrash are not the same at all. It was just used to introduce to the readers how the idea of double doubts work in Halacha. And how, according to Rav Shimon Shkop – that word is a mistranslation. It should be a Doubt in Doubt rather than a double doubt.

In the secular system a single reasonable doubt is enough to acquit of a murder; in halacha, witnesses are required to establish guilt in a murder or killing, while a sfek sfeika regarding Kashrus two doubts are specifically required.

The author can be reached at [email protected]