without sufficent evidence to prove guilt beyond a reasonable doubt.
有關 BEYOND A REASONABLE DOUBT 的一個較詳細的定義如下
beyond a reasonable doubt
adj. part of jury instructions in all criminal trials, in which the jurors are told that they can only find the defendant guilty if they are convinced "beyond a reason- able doubt" of his or her guilt. Sometimes referred to as "to a moral certainty," the phrase is fraught with uncertainty as to meaning, but try: "you better be damned sure." By comparison it is meant to be a tougher standard than "preponderance of the evidence," used as a test to give judgment to a plaintiff in a civil (non-criminal) case.
See also: conviction moral certainty reasonable doubt
資料來源
http://dictionary.law.com/default2.asp?selected=59&bold=