This is a complaint and warrant charging that the defendant did “* * * wilfully' fail and refuse to comply with the lawful order of Officer Thomas Lombardo, a Westerly, Rhode Island Police Officer, invested *311 by law with authority to regulate control and direct traffic, in violation of Title 31, Chapter 12, Section 3, of the General Laws of Rhode Island 1956 as amended.” 1 The case was tried to a jury in the Superior Court, which subsequently returned a verdict of guilty. From that verdict the defendant has prosecuted a bill of exceptions to this court.
The evidence discloses that on October 18, 1968, about 9:15 a.m., defendant parked a motor vehicle at the intersection of High and Broad Streets in the town of Westerly. Officer Lombardo testified without contradiction that he was patrolling that area dressed in the usual uniform of a police officer, wearing a badge on his chest and a shield on his cap which identified him as a police officer. He further testified that he asked defendant not to park his car in the middle of the street or it would have to be towed away. The defendant replied that he was making a delivery and started to walk away. Officer Lombardo then proceeded to a police booth to call for a tow truck to have the car removed from the highway, and defendant thereupon went back to his car and drove away.
Later that morning, about 11 a.m., defendant returned to the same intersection and once again parked his car, according to Officer Lombardo, in the middle of the street and proceeded to make a delivery. 2 The officer testified that he told defendant that unless he moved the car, he would be placed under arrest, to which defendant replied: “Go ahead and place me under arrest.” The officer thereupon took defendant into custody and subsequently charged him with a violation of the above-mentioned §31-12-3.
*312 The defendant contends that §31-12-3 was enacted in violation of art. I, sec. 19, and art. IV, sec. 2, of the Rhode Island constitution and of art. XIV, sec. 1, of amendments to the United States Constitution in that it is arbitrary, capricious, and constitutes an unlawful delegation of legislative power. 3 An examination of defendant's brief, however, is persuasive that he is arguing primarily that the section is unconstitutional by reason of vagueness and indefiniteness. We do not agree.
The test for determining the definiteness of a statute within the contemplation of the constitution is aptly stated in
Tinsley
v.
City of Richmond,
In this state we have adopted the same criteria for the determination of definiteness in a constitutional sense. In
State
v.
Jamgochian,
109 R. I. 17,
We are of the opinion that a reasonable man reading this statute would be made aware of what he is required to do and the circumstances in which he is required to do it. It was enacted as part of a statutory declaration of the scope of the application of traffic regulations and clearly was intended to have its application limited to the control and regulation of traffic. It requires that one shall not willifully refuse to comply with the' lawful order of a police officer who has been legally empowered to direct, control, and regulate traffic.
Its provisions are certain and definite, pointing with reasonable specificity to the prohibited conduct, and it is so written that a man of common understanding can ascertain therefrom what he may and may not do. State v. Jamgochian, supra. Its limitations on the authority of the officer to make an arrest are quite clear. It does not leave the question of an arrest to the whim of the police officer or to the moment-to-moment opinions of a policeman on his beat. In such circumstances it is our conclusion that the statute is neither so indefinite nor so arbitrary of application as to be constitutionally void.
The defendant contends also that the officer, in taking him into custody, acted in excess of the authority conferred upon him by §31-12-3. He argues, first, that the officer has no authority under the statute to order the removal of an illegally parked vehicle unless such vehicle is obstructing vehicular or pedestrian traffic. We cannot agree. Nothing in the statute limits the authority of the police officer to issue an order that will forestall the obstruction of traffic, nor is there anything that warrants our finding that a standing vehicle, illegally parked or otherwise, is *314 not traffic within the purview of §31-12-3. To hold otherwise would be to defeat the obvious purpose of the statute, which is to prevent congestion of traffic, a result likely to flow from the obstruction of the highway by a standing vehicle.
He argues further that the police officer was not engaged in the control, direction, and regulation of traffic and, therefore, was not a police officer contemplated in §31-12-3. We see no merit whatsoever in this contention. The statute does not prescribe that the officer must be engaged exclusively in the control or direction of traffic or that he must be specifically assigned to such duty. The evidence shows that the officer was in uniform and was on patrol, and in these circumstances, in our opinion, he had authority to control and regulate traffic.
The defendant further contends that his prosecution in the instant case for a violation of §31-12-3 deprives him of his fourteenth amendment right to the equal protection of law. During trial he made an offer of proof, in which he contended that he could adduce evidence to the effect that the police officer, in ordering him to move his vehicle, ignored the presence of two other vehicles parked in the same area. The defendant argues that in not prosecuting the operators of the other vehicles the officer acted arbitrarily and violated his right to equal protection.
However, while the proof offered would tend to establish that other vehicles were illegally parked in the same area, it would not establish that the operators of the other parked vehicles had willfully refused to comply with an order of the officer to remove them. It is our opinion, then, that the offer of proof was insufficient in that it fails to disclose in reasonable detail the admissible evidence on which he would rely.
Manning
v.
Redevelopment Agency,
103 R. I. 371,
In
State
v.
Pinsince,
105 N. H. 38, 41,
The defendant’s offer of proof is insufficient for another reason. It is well settled that the mere fact that other offenders have not been prosecuted does not constitute a denial of due process or equal protection; intentional or purposeful discrimination must be shown.
Snowden
v.
Hughes,
Consequently, if we were to accept defendant’s offer of proof as fully proved, that he was prosecuted for a violation of the statute, §31-12-3, while others who committed *316 the same offense had not been prosecuted, it is clear that he has failed to allege or offer proof that the officer acted purposefully and intentionally to discriminate against him, a showing which is essential to establishing a denial of equal protection. 4
We turn to defendant’s contention that the state is es-topped from prosecuting him in the instant case because it has successfully prosecuted him for the performance of the act out of which the instant prosecution springs. We assume that he is contending that his prosecution for disobeying the lawful command of the police officer as required in §31-12-3 is invalid because the charge arose out of the same criminal transaction as another charge, unlawfully parking in an intersection, §31-21-4(3). In our opinion, the weight of authority is to the contrary.
In
Blockburger
v.
United States,
In
Gore
v.
United States,
The defendant relies on
Ashe
v.
Swenson,
The Court’s holding in
Ashe
does not support defendant’s contention. In the first place, the doctrine of collateral estoppel is of no use to a defendant who has been convicted in a previous prosecution, but rather can be employed by a defendant who has been acquitted in an earlier prosecution and seeks to bind the state by the jury’s earlier finding of no guilt.
Ashe
v.
Swenson, supra,
at 459,
The defendant also contends that the trial justice erred in denying his motion that a witness, the Town Clerk of the Town of Westerly, be ordered orally by the court to go to the Town Hall and to return, after a recess, to the court with certain records that apparently were related to town council action concerning the regulation of parking in Dixon Square in the town of Westerly. The court refused to so direct the witness and suggested that, if defendant wanted records concerning the town council’s action, he should issue a subpoena duces tecum requiring the witness to produce the desired records.
The question here raised is whether it was prejudicial error on the part of the court to deny defendant’s motion that the court orally direct the witness to obtain the records. We think not. It is clear that defendant’s motion was directed to the discretion of the court. The defendant cites no authority holding that the denial of such a request was an abuse of judicial discretion but argues only that, the witness being in court, there was no necessity for issuing a subpoena duces tecum to obtain the record. In
Central Soya Co.
v.
Henderson,
99 R. I. 388,
It cannot be doubted but that the oral order sought by defendant would have fallen far short of the requirement of certainty in a subpoena duces tecum in that it would not inform the witness with reasonable certainty of the particular records that were to be produced. Clearly, it was within the discretion of the trial justice to protect the witness from the burdensome difficulties that would be encountered were she confronted with a vague, indefinite oral direction to produce the records of the town council action contemplated. In denying the motion, the court also suggested to defendant that he resort to the proper procedure for the procuring of such records, that is, issuing a subpoena duces.tecum specifically identifying the records wanted and establishing their relevance and materiality on the issue in the case. In other words, he denied defendant’s motion for the oral order and informed him he had recourse in the premises to the use of a subpoena duces tecum.
In these circumstances we cannot say that the denial of defendant’s motion by the trial justice constituted an abuse of his judicial discretion. The defendant obviously was not prejudiced, inasmuch as by the issuance of a subpoena duces tecum he could have obtained the desired records. In our opinion, the denial of this motion was not error.
Lastly, we note that the defendant contends that the admission of the testimony of Officer Lombardo concerning his appointment and qualification as a police officer violated the best evidence rule, so called, and its admission *320 constituted reversible error. In State v. Ramsdell, No. 533-Ex., filed December 17, 1971, this identical contention was rejected by this court. We, therefore, hold that no error inhered in the admission of Officer Lombardo’s testimony as to his status as a police officer.
All of the deféndant’s exceptions are overruled, and the case is remanded to the Superior Court for further proceedings.
Notes
Section 31-12-3 reads as follows: “No person shall wilfully fail or refuse to comply with any lawful order or direction of any police officer invested by law with authority to direct, control, or regulate traffic.”
The defendant testified that he had parked his vehicle “in the middle of the intersection of 'those two streets.” ' • • . • ■
It would appear that defendant’s reference to art. I, sec. 19, is inadvertent, that section providing: “No soldier shall be quartered in any house, in time of peace, without the consent of the owner; nor, in time of war, but in a manner to be prescribed by law.” We are unable to perceive anything in 131-12-3 that could be violative of said art. I, sec. 19.
The defendant’s plea of estoppel, in our opinion, likewise fails to allege grounds that would establish the purposeful and intentional discrimination against the defendant.
