guilty of an assault on a police officer, there would have been no necessity of invoking Penal Code section 1202b.
The finding, implied in the verdict finding defendant guilty of a battery on a police officer, rests upon circumstantial evidence as to the identity of the person striking Officer Bentley’s left hand, whereas the testimony of percipient witnesses establishes that defendant was threatening injury to Officers Bentley and Heider by poking his crutch through the glass portion of the door, reaming the shattered glass aperture, and trying to hit them.
Whether an off duty police officer, in uniform and paid by a source other than from his official employer, in preserving the peace at a public high school dance, assisting the vice-principal to keep out intruders, and protecting the public high school property from damage, is engaged in performance of his duty is a question of law, and the jury should be guided by an appropriate instruction on this issue.
The instruction as to an assault in terms of superseded CALJIC 9.00 was erroneous in its requirement of a specific intent (People v. Rocha (1971) 3 Cal.3d 893, 898 [92 Cal.Rptr. 172, 479 P.2d 372], handed down after the trial of the instant case), but it was error favorable to defendant.
However, the trial judge never instructed the jury that either a simple battery or a simple assault, either of which would be a misdemeanor only, was also a lesser and necessarily included offense. He should have so instructed sua sponte. (See People v. Hood, supra, 1 Cal.3d 444, 449; People v. Cooper (1968) 268 Cal.App.2d 34 [73 Cal.Rptr. 608].)
At the time of voir dire examination of the prospective jurors, three persons indicated that they ■ had not previously served as jurors in a criminal case. The trial judge then stated: “[F]or the benefit of the three persons, I will state that since this is a criminal case the burden or [sic] proof rests upon the People to establish guilt of the defendant beyond a reasonable doubt and also that in a criminal case the defendant is presumed to be innocent of the charges against him until proved guilty by the People by evidence beyond a reasonable doubt. [Par.] I will give you Instructions at the appropriate time as to what constitutes a reasonable doubt. Suffice it to say at this time we use the words moral certainty, a conviction to a moral certainty. The People do not have to prove their case in all events to an absolute certainty.” However, the instruction as to reasonable doubt and presumption of innocence was apparently inadvertently omitted at the time the jury was formally instructed. Penal Code section 1093, subdivision 6, permits a judge in a criminal case to instruct the jury sua sponte