The defendant appeals from his conviction of operating a motor vehicle while under the influence of intoxicating liquor. He challenges the denial of his motion to suppress evidence obtained on July 7, 1984, at a roadblock maintained by State troopers on Route 12 in West Boylston. That motion, which was based on both the Fourth Amendment to the Constitution of the United States and art. 14 of the Massachusetts Declaration of Rights, should have been allowed. The Commonwealth failed to prove the reasonableness of the roadblock *99 as a result of which all evidence against the defendant was obtained. 1
A State police corporal presented the only evidence concerning the purpose of the roadblock, the principles on which it was established, and the manner in which it was conducted. He gave the name of the captain who, he believed, was responsible for setting up the roadblock. He testified that the State police set up roadblocks in well-lit locations where there are parking areas to which vehicles can be directed. Signs announcing roadblocks are posted. Marked cruisers, some with their dome lights flashing, are parked at the site. For this particular roadblock, ten officers were assigned. Officers posted warning signs, placed traffic cones between the signs and the roadblock, and turned on the dome lights of several marked cruisers. Every vehicle was stopped from about 11:30 p.m. on July 6 to about 2:30 a.m. on July 7. The procedure followed was the same as that used in other roadblocks in which the corporal had participated. He did not know, however, whether the State police had announced to local news media that roadblocks would be conducted in the area that night.
In
Commonwealth v. McGeoghegan,
In our
McGeoghegan
opinion, however, we also suggested that “assurance must be given that the procedure is being con
*100
ducted pursuant to a plan devised by law enforcement supervisory personnel.”
Id.
Other courts have observed that, regardless of other favorable factors, the lack of control over the discretion of officers in the field will render a roadblock stop unconstitutional.
People
v.
Bartley,
The Commonwealth offered no evidence of a plan devised by law enforcement supervisory personnel for establishing and conducting the roadblock at which the State police stopped the defendant. The record contains no evidence of guidelines, like those upheld in
Commonwealth
v.
Trumble,
We grant that, when the defendant’s motion to suppress was considered and decided, the judge and the prosecution did not have the benefit of our opinion in the
Trumble
case. Our
McGeoghegan
opinion was available then, as it was to the prosecutor in the
Trumble
case. The Commonwealth’s case here did not meet the standards that we prescribed in our
McGeoghegan
opinion. Because the Commonwealth did not meet its burden of proving that the stop and search were constitutionally reasonable, the motion to suppress should have been allowed.
Commonwealth
v.
McGeoghegan, supra
at 144. We believe that the Commonwealth did not make an adequate showing to satisfy the requirements of the Fourth Amendment. We know it did not satisfy the requirements of art. 14 of the Declaration of Rights. See
Commonwealth
v.
Ford,
We need not pass on the question, not yet answered by a majority of this court, whether a roadblock will meet constitutional standards only if the Commonwealth proves that no less intrusive alternative would be as effective. See Commonwealth v. Trumble, supra at 86; id. at 97-98 (Abrams, J., concurring); id. at 98-102 (Lynch, J., joined by Liacos, J., dissenting). The Commonwealth did not present evidence at the motion hearing on this question. Because the defendant has not argued this question in his brief, it is not before us.
The judgment is reversed. The verdict is vacated. An order shall be entered allowing the defendant’s motion to suppress. A judgment of not guilty shall be entered because all evidence on which the conviction was based should have been suppressed.
So ordered.
Notes
The arresting officer had neither probable cause nor an articulable, reasonable suspicion to stop the defendant’s vehicle. The evidence obtained was admissible, therefore, only if the roadblock at which the State police stopped the defendant was lawful.
Commonwealth
v.
McGeoghegan,
We also noted that, although the same factors are material to a consideration of the constitutionality of a roadblock stop under both documents, the “Massachusetts Declaration of Rights may afford greater protection to an individual than the protection afforded by the United States Constitution.” Id. at 141 n.2.
