delivered the opinion of' the Court.
Petitioner was convicted of violating the Narcotic .Act. 26 U.S.C., 692, 705. The conviction was affirmed by the Circuit Court of Appeals, 62 F. (2d) 746, and this Court granted certiorari.
Reversal is sought upon thé ground that the instructions of the trial court to the jury exceeded the bounds of fair comment and constituted prejudicial error. ’After testimony by agents of the Government in support of the indictment, defendant testified, making a general denial of all charges. His testimony is not set forth in the record. Defendant’s, motion for a direction, of verdict and requests for rulings substantially, to the same effect were denied. The court instructed the jury concerning the rules as to presumption of innocence .and reasonable doubt, and stated generally that its expression of opinion on the evidence was not binding on the jury and that it was their duty to disregard the court’s opinion as to the facts if the jury did not agree with it. The court ruled as matter of law that ff the jury believed the evidence for the Government it might find the defendant guilty. The court then charged the jury as follows:
“ And now I am going to tell you what I think of the defendant’s testimony. You may : have noticed,, Mr. Foreman and gentlemen, that he wiped his hands during his testimony.. It is rather a curious thing, but that is almost always an indication of lying'. Why it should be so wé don’t know, but that is the fact. I think that every single word that man said, .except when h.e agreed with the Government’s testimony, was a lie. r
*469 “ Now, that opinion is an opinion of evidence and is not binding on you, and if you don’t agree with it, it is your duty to find him not guilty.”
To this charge the defendant excepted. ■
• In a trial by jury in a federal court/ the judge is. not a mere moderator, but is thé governor of the trial for the purpose of assuring its proper conduct and of determining questions of law.
Herron
v.
Southern Pacific Co.,
. This privilege of the judge to comment on the facts has its inherent limitations. His discretion is not arbitrary and uncqntrolled, but judicial, to be exercised in conformity with the standards governing the judicial office. In commenting upon testimony he may not assume the role of a witness. He may analyze and dissect the evidence, but he may not either distort it or add to it. His privilege of comment in order to give' appropriate assistance-to the jury is too important to be left without safeguards against abuses. The'influence of the trial judge on the jury •“ is necessarily and properly of great weight ” and “ his, lightest word or intimation is received with deference, and may prove controlling.” This Court has .accordingly emphasized the duty of the trial judge to use great care that an expression of opinion upon the evidence ■“ should be so given as not to mislead, ahd especially that .it should not be one-sided”; that “deductions and theories not warranted by the evidence should be studiously avoided.”
Starr
v.
United States,
In the instant case, the trial judge did not analyze the evidence; he added to it, and he based his instruction upon his own addition, Dealing with á mere mannerism of the .accused in giving his testimony, the judge put his own experience, with all the weight that could be attached to it, in the scale against the accused. He told the jury *472 that “ wiping ” one’s hands while testifying was “ almost always an indication of lying.” Why it should be so, he was unable to say, but it was “ the fact.” H,e did no.t review the evidence to assist the jury in reaching the truth, but in a sweeping denunciation repudiated as a lie all that the accused had said in his own behalf which conflicted with the statements of the Government’s witnesses.' This was error and ye cannot doubt that it was-highly prejudicial.
Nor do we think that the error was cured by the statement of the trial judge that his. opinion of the evidence was not binding on the jury and that if they did not agree with it they should find the defendant not guilty. '• His definite and concrete assertion of fact, which he had made with all the persuasiveness of judicial utterance, as to the basis of his opinion, was not withdrawn. His characterization of the manner and testimony of the accused was of a sort most likely to remain firmly lodged, in the memory of the jury and to excite a préjudice which would preclude a fair and dispassionate consideration of the evidence.
Starr
v.
United States, supra; Mullen
v.
United States, supra; Wallace
v.
United States,
The judgment must be
Reversed
