"The principle that there is a presumption of innocence in favor of the accused is the undoubted law, axiomatic and elementary, and its enforcement lies at the foundation of the administration of our criminal law."
- Coffin et al v. United States (1895), the Supreme Court case which codified the presumption of innocence for people accused of crimes
People are innocent until proven guilty, and do not have to "prove" their innocence
There's a saying in America that is often quoted in these contexts, which is that people are "innocent until proven guilty." This saying is so familiar to Americans that we often take it for granted, I think. We may not always realize how rare it is in the world to have this kind of default assumption. In this country, the burden of proof is on the prosecution - or in civil cases, the "plaintiff" - rather than the defendant. The defendant is not even required to open his or her mouth to "prove" his or her own innocence. This is not written explicitly into our Constitution, but it is implied by a number of amendments, and was codified by the Supreme Court case quoted above. Moreover, a jurist from a previous century named Sir William Blackstone - a man who is quoted in the Federalist Papers - proclaimed that "the law holds, that it is better that ten guilty persons escape than one innocent suffer." (Source: Blackstone's "Commentaries," Book IV, Chapter 27) This doctrine is sometimes known as "Blackstone's formulation" or "Blackstone's Ratio."
William Blackstone
William Blackstone thought it "better that ten guilty persons escape than one innocent suffer"
John Adams expounded on "Blackstone's Ratio" in the "Boston Massacre" trial, when he said that "We are to look upon it as more beneficial, that many guilty persons should escape unpunished, than one innocent person should suffer. The reason is, because it’s of more importance to community, that innocence should be protected, than it is, that guilt should be punished; for guilt and crimes are so frequent in the world, that all of them cannot be punished; and many times they happen in such a manner, that it is not of much consequence to the public, whether they are punished or not. But when innocence itself, is brought to the bar and condemned, especially to die, the subject will exclaim, it is immaterial to me, whether I behave well or ill; for virtue itself, is no security. And if such a sentiment as this, should take place in the mind of the subject, there would be an end to all security what so ever." (Source: Adams' Argument for the Defense, 3-4 December 1770) When a person really is guilty of a crime (as sometimes happens), this can still make it somewhat difficult to bring criminals to justice, of course. Thus, the police force and prosecutors have to possess a high degree of skill to provide the necessary proof of these actions. But if these protections are not in place (and many countries don't have them), then innocent people are vulnerable to an arbitrary tyranny that can punish them at will; and there are few things that Americans fear more than an absolute government with unlimited power. Thus, there must be a balancing act in any free country between individual protections and criminal justice, where the people are protected against both unlimited government and violent criminals. Thus, it might be helpful to go over some of these constitutional protections from our Bill of Rights.
John Adams, the defense attorney in the "Boston Massacre" trial


 










 
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