The defendant appeals from his conviction of murder in the first degree, and assigns as error the judge’s *107 refusal to allow him to sit at counsel table during trial. He also asserts error in the judge’s refusal to allow impeachment of a prosecution witness by means of a polygraph test, and he argues a number of other evidentiary issues. We affirm the conviction.
The crime was committed in August, 1972. The defendant was indicted in January, 1976, and tried the following June. More than thirty-five witnesses testified at the trial, which lasted two and one-half weeks. The verdict of guilty was returned June 18, 1976.
We briefly summarize the evidence. The victim was a part owner and construction supervisor of a condominium project in Salem, and was found dead in his townhouse at the site shortly after 8:30 a.m. on August 14, 1972. His skull had been fractured by repeated blows with a blunt instrument, and death could have occurred at any time between 11 p.m. on August 13 and 8 a.m. the following morning. There were no signs of forced entry.
The defendant was a foreman at the project, and had a master key to the project buildings. There was antagonism between him and the victim. Four witnesses testified that the defendant had admitted the killing, and three of them described in detail the circumstances of the murder as told by the defendant.
The defendant testified in his own behalf. He admitted that he was at the project for a short time during the early morning hours of August 14, but denied killing the victim. He explained that he went to the project from his wife’s home in Newton, New Hampshire, to exchange a truck for a rental car, so that his wife could use it for a trip on August 14. He stopped briefly at the company’s cottage in Dan-vers, drove the car home, stayed there a short time, and reported for work about 7 a.m. After giving out work assignments, he again left the site. He testified that he first learned of the victim’s death when he returned to work about 8:30 that morning.
1. The prisoner’s dock. At a pretrial conference defense counsel agreed to the prosecutor’s request that the investí- *108 gating detective sit at counsel table. He then requested that the judge allow the defendant to sit at counsel table, explaining that the defendant had a hearing problem and that it was critical to have quick access to his client. He continued: “Also, and I know there is no basis that I know of in law for this, but there has always been something that has bothered me about that prisoner’s dock, the effect that it has on the jury psychologically seeing a man in that enclosure.” The judge noted that the court room had an amplification system, and said, “I will make some inquiry from the sheriff to see, because the Sheriff has, of course, the responsibility of security, so I will make some inquiry with reference to your request to have him sit next to you. That depends on security.” The results of the inquiry and the reasons for denying defense counsel’s request do not appear in the record, but there is no dispute that the defendant sat in the dock during the trial. During trial the prosecutor referred to “[t]he man sitting in this wooden enclosure,” and the judge instructed the jury that “[wjhere the defendant sits is a matter of custom like so many other things, [and] has no consequence.”
Most court rooms used for criminal sessions in the Commonwealth are equipped with a dock, a wooden enclosure, usually measuring four or five feet square, in which it has long been customary for the defendant to sit during trial. The dock is open at the top, so that the upper torso of a seated person is visible. The judge, the court clerk, court officers and the jury occupy similar enclosures, the arrangement of which varies from court room to court room. The dock as we know it appears to be a vestige of the English baledock: “[A] small room taken from one of the corners of the court, and left open at the top; in which, during the trials, are put some of the malefactors.” See
Illinois
v.
Allen,
There are few reported cases in other jurisdictions concerning the use of docks. Placement of defendants in the dock, “as was the English custom,” was preferred to the
*109
use of more extreme measures such as “gyves” and shackles in
State
v.
Kring,
We have often held that it is within the judge’s sound dis- „ cretion whether to grant a defendant’s request to sit at counsel table or elsewhere.
Commonwealth
v.
Walker,
*110
In
Walker
v.
Butterworth,
For the future, we think that a judge confronted with a request that the defendant be permitted to sit at counsel table should not deny the request unless he follows the “more circumspect procedure” we have prescribed for unusual security measures. See
Commonwealth
v.
Brown,
In the present case, the defendant did not sharply raise a constitutional objection. Although it would have been better for the judge to state on the record his reasons for seating the defendant in the dock, it is evident that the judge was concerned with security. It is unclear from the record whether there were less restrictive measures to preserve security. If there was error, we are unable to discover any risk of prejudice. Defense counsel was able to consult with the defendant throughout the trial, and no question of identification arose that might render the defendant’s relative isolation in the dock unduly suggestive. Cf.
Commonwealth
v.
Napolitano,
2. Polygraph evidence. The defendant claims error in the exclusion of evidence of a polygraph test, offered to impeach a prosecution witness. Bransky, a prosecution witness, testified to damaging admissions made by the defendant shortly before and after the murder. He also testified that originally he had repeatedly told the police he knew nothing about the murder, and that he first gave them *112 information consistent with his trial testimony in June, 1975, after promises of immunity from prosecution. The judge excluded evidence that a polygraph test administered by the police on August 28, 1972, showed a truthful response when the witness denied having conversations with the defendant regarding the murder.
Shortly after the murder, as part of their investigation, State police conducted polygraph examinations of the defendant, the witness Bransky, and at least three other workers at the condominium project. At a pretrial conference, defense counsel moved for production of the test results, saying that “all these people took those tests at their risk, waiving whatever rights they had at that time.” The prosecutor said he had given defense counsel all copies of test results that he had, and indicated that the report on Bransky showed a truthful response. During the trial the judge ruled that the matter was one of discretion, that he would permit witnesses to testify to statements by the defendant that he “beat” a polygraph test, and that he would allow in evidence the fact that the defendant took such a test on August 14, 1972, and whatever results were shown, but that he would not permit reference to polygraph tests taken by other witnesses. The polygraph examiner was unavailable at trial because of illness; the parties entered into a stipulation relating to the defendant’s test, but it was never offered in evidence. The only polygraph question before us relates to the exclusion of evidence as to the test given to Bransky.
We have dealt with evidence of polygraph tests taken by criminal defendants in several cases.
Commonwealth
v.
Allen,
Decisions in other jurisdictions disclose differences of opinion similar to the differences over the use of a defendant’s polygraph test. See
Commonwealth
v.
Vitello,
*114
Defendants have not had much success in offering the results of unsuccessful polygraph tests to impeach prosecution witnesses. See, e.g.,
State
v.
Christopher,
In this situation we think it the part of wisdom to reserve again the question whether evidence of a polygraph test is ever admissible to impeach a prosecution witness. Assuming, without deciding, that it may be, we think the matter must rest largely in the discretion of the trial judge, and we find no abuse of discretion here. We do not rely on the absence of a stipulation, since the witness took the test voluntarily at the instance of the Commonwealth, and the examiner was chosen by the Commonwealth. But the witness was only one of a number of potential prosecution witnesses who had taken polygraph tests; his testimony was no more crucial than that of several other witnesses; and the danger of diversion and confusion may well have outweighed any probative value. Moreover, there was no showing or offer of proof that the test, in the circumstances, was reliable.
3.
Evidence of tracking by dog.
Over the defendant’s objection, a police officer trained as a dog handler was permitted to describe the track followed by a trained dog through the condominium project after the dog was given a scent from the defendant’s shirt. There was no error.
Com
*115
monwealth
v.
LePage,
4. Other evidentiary issues. The defendant also argues that the prejudice due to the cumulative effect of five other evidentiary rulings, claimed to be erroneous, requires reversal. Each of the alleged errors seems inconsequential, and they do not seem to reinforce each other. But we are unable to find any error at all.
(1) The ex-wife of a prosecution witness was called by the defendant to impeach the witness through evidence of his reputation for veracity. She had moved out of the community seven years before the trial, but had continued to teach school there and had maintained business and social contacts there. The judge excluded her testimony because her knowledge of her ex-husband’s reputation was too attenuated. There was no abuse of discretion.
Commonwealth
v.
Belton,
(2) A friend of the defendant’s wife testified over objection to a conversation between the defendant and his wife with reference to washing or burning his clothes. The witness could not remember any response by the defendant, and was unsure which person mentioned burning. The evidence was offered to show the defendant’s state of mind, and was not hearsay.
Commonwealth
v.
Fiore,
(3) Bransky testified that he and the defendant stole a stove from the project some three months after the murder. Taken by itself, this evidence was remote, but there was other evidence that the defendant had admitted stealing appliances from the project and that he thought the victim knew it. The evidence was relevant to show motive.
Commonwealth
v.
Brown,
*116
(4) Officer McNulty testified to a conversation with the defendant in which McNulty made clear accusations and was met with equivocal replies. At the close of the conversation, he testified, he told the defendant he would “get” him but would not lie; he would “play the game straight.” The defendant failed to object to those statements at the time, and no error is presented for review.
Commonwealth
v.
Freeman,
(5) There was testimony that the defendant made derogatory statements about the victim in August, 1975, three years after the murder. Those statements were part of what amounted to a confession by the defendant, and the defendant’s contention that they were too remote in time is frivolous.
5. Section 33E. Pursuant to G. L. c. 278, § 33E, we have examined the entire record, and have found no reason to disturb the conviction.
Judgment affirmed.
