The defendant was tried and convicted in the Superior Court upon eight indictments charging assault and battery by means of a dangerous weapon, commis *478 sion of unnatural acts, breaking and entering, larceny, and armed robbery. Among other witnesses four adult womеn, victims of the defendant’s conduct, testified. His defence was insanity. Two experts testified for the defence; three for the Commonwealth. The defendant did not testify. The history taken by all the experts showed the defendant to be subject to abnormal, very intense, and frequently recurring sexual urges. The experts agreed that he was mentally ill and dangerous but differed as to whether he acted under impulses which he could not control. General Laws c. 278, §§ 33A to 33E, were made applicable to the trial and the dеfendant has appealed.
The charge so stated the test of criminal responsibility formulated in the Model Penal Code (Am. Law Inst. Proposed Official Draft £19623 p. 66, § 4.01) along with the words of the classic
Rogers
test
(Commonwealth
v.
Rogers,
The defendant contends that even though, as we have indicated, the adoption of the Code test does not mean that it was error to conduct a prior trial under the Rogers case language, nevertheless it was prejudicially confusing to refer to both tests. There is nothing in this. It was plainly helpful to the defеndant’s case to qualify the Rogers case test in what the defendant describes as “the more workable and desirable language” of the Code. 1
*479 The defendant’s first witness, although testifying before the judge had ruled that the language of the Code test might be used in the examinаtion of experts, in effect testified that the defendant did not meet the Rogers test because he lacked substantial capacity to appreciate and to control his conduct. There was therefore no harmful error in excluding a question tо him in the express terms of the Code, even though the question was allowed as to later witnesses.
The defendant excepted to the exclusion of certain testimony offered for the purpose of showing that he had committed sexual attacks on and had murdered a number of women in the period from June, 1962, to January, 1964. The judge had permitted each expert to testify to the history of the defendant as it was derived from his interviews with the defendant and certain records. Thus the jury heard from the defendant’s two еxperts their account of his statements about those crimes but under appropriate instructions that this was not proof that the defendant had committed them.
Commonwealth
v.
Belenski,
The defendant excepted to the refusal of the trial judge to allow a former assistant attorney general to testify to his interviews with the defendаnt. The offer of proof was that the interviews were in the presence of the defendant’s guardian and were for the purpose of advising certain psychiatrists assigned by the Commonwealth whether the defendant was subject to delusions or was feigning or wаs telling the truth as to the murders. The other part of the *480 defendant’s proposed demonstration was shown in the offer to have a Boston poEce officer testify to instructions from the assistant attorney general and his resulting verification of the truth of cеrtain physical facts stated by the defendant in the interviews.
This was plainly inadmissible evidence. It had no standing as “history” appraised by an expert and underlying his opinion. A party cannot put in incompetent evidence to fortify his experts’ opinions.
Commonwealth
v.
Sinclair,
The defendant excepted to the exclusion of a Ene of inquiry to Dr. Samuel Allen, another of the Commonwealth’s experts, and Medical Direсtor at Bridgewater State Hospital. Dr. Allen had testified that he had heard mentioned in several places by several people the events in the period from June, 1962, to January, 1964, but did not receive a history of them “in the form of a history.” The question, the exclusion of which cut off other questions, was whether an official went to Bridgewater to determine if the defendant’s story was factual. The offer of proof was that the defendant through his attorneys and guardian had assented to a prolonged interrogаtion by an assistant attorney general taken by agreement between the Commonwealth and the defendant as to the reEability of the defendant’s account, and that Dr. Allen was one of the psychiatrists for whose benefit this history was taken.
There was no error. The issue is not presented whether in the course of his study to form an expert opinion a physician must in all circumstances get the entire history by his
*481
own inquiries and confine himself to talks with the defendant.
2
Dr. Allen could not properly be cross-examined about conduct of the defendant not in evidence and not appraised by him as a part of his study and evaluation of the defendant.
Commonwealth
v.
Harrison,
Further, the defendant shows no prejudice. The transcript persuasively suggests that he had all possible advantage from the circumstance that Dr. Allen had some information in respect of the defendant’s assertions as to the other crimes. The physician’s further testimony was that he “certainly would” consider that a history of homicidal conduct would be significant diagnostically in arriving at an opinion as to the defendant’s ability to resist impulsive acts; that if it appeared that the conduct was sexually “motivated or accelerated” he would consider that significant; and his opinion that the defendant had not acted under irresistible impulse in the crimes being tried had been arrived at “practically without” such a history. In his opinion the dеfendant is insane, and is suffering from mental illness, de *482 fined as mild schizophrenia, but sufficiently severe so that he is committable because he is sick and dangerous.
The defendant excepted to the exclusion of a question to his own expert, Dr. Robert R. Mezer, seeking his testimony that he had information that the victims in almost all the homicides had been left in singular, bizarre and obscene positions, that the bodies of some of them had been subjected to shocking indignities and that this was schizophrenic conduct. The physiciаn had already testified that bizarre conduct was significant in diagnosing schizophrenia. The offer of proof was not confined to information which had come to the physician as history evaluated by him in forming an expert opinion as to the defendаnt. The implication was that the doctor was being asked to give an expert opinion on the significance of what he had heard that the police had found. 3 Such testimony of the witness was not admissible on any ground.
The defendant finally contends that the evidence so plainly shows that he was without substantial control that we should rule that the verdict cannot stand. We may not do this. Experts having differed, as was to be expected in a borderline case
(Commonwealth
v.
McHoul,
It is not a basis for a legal ruling that the defendant is without substantial capacity to control his conduct that
*483
those experts who testify that he has such capacity also testify that he is mentally sick or that a cure is doubtful or that he should be committed because he is dangerous. The Code test does not apply the
Durham
rule.
Durham
v.
United States,
Criminal acts having been committed, and the evidence not being conclusive, a determination was required whether the perpetrator was responsible or irresponsible under the law. No better way appears to determine that than by leaving to the twelve citizens of the jury the application of a reasonable and understandable rule after a fair trial and under fair and full instructions. That is what happened in this case.
Judgments affirmed.
Notes
The’ examination and cross-examination reflected concepts that arose under the Rogers case formulation but this did not prejudice the defendant.' For example, to the extent that Commonwealth experts based their conclu--. sions on the view that the defendant would not have acted as he did with a ’ *479 "poEeeman at his elbow,” they opened for the defendant the argument that ■ this did not show substantial capacity to conform to the requirements of law, the defendant’s conduct taking place in the absence of legal restraint or of confinement.
See
Commonwealth
v.
McGruder,
“ [T]he doctor would recite the following examples .... In almost all of the homicides, the victims were left in a single [singular?] and ludicrous position .... In one . . . [an object] was found ... [as described] and in another . . . [an object] was found ... [as described]” (emphasis supplied).
One of the Commonwealth’s experts testified that he had earlier been of the view that the defendant was not responsible under the Code test. There was expert testimony that the line between psychosis and sociopathic behavior was uncertain. Onе expert who gave great weight to the “policeman at the elbow” test recognized that the defendant had “some abnormal compulsion that drives him to the abnormal sexual gratification” and although in a controlled situation he is quiescent, whеn not in a controlled situation he sometimes becomes extremely violent, so “there is a compulsion of some sort.”
In many if not most cases the expert description of a disease and its effect on the defendant’s conduct will be more significant than the concluding views of the expert as to criminal responsibility under the carefully formulated legal test. The testimony in this case showed that overall impressions and feelings have a part in expert conclusions. Although experts must weigh all factors much as the jury must do, their testimony must not in effect usurp the jury’s functions. See
Washington
v.
United States,
