The presumption of innocence is a legal doctrine that mandates, in a criminal trial, that the government carries the burden of proving the charges against the defendant beyond a reasonable doubt. Because Lee Harvey Oswald was never tried and convicted, he is presumed innocent. O. J. Simpson, tried and acquitted of double murder, is also presumed innocent under the law. The presumption of innocence, however, is not a substitute for common sense. For example, you would never let an accused pedophile, a person presumed to be innocent, babysit your child.