Thе defendant, Craig A. Carey, was found guilty of unlawful possession of a firearm after a bench trial in the Woburn Division of the District Court. He sought a de novo trial before a jury of six in the Lowell Division of the District Court, and in that proceeding filed a motion to suppress both a sawed-off rifle discovered in a warrantless search of his high school locker, and his statement to a police officer, acknowledging that the gun was his. After a hearing, the judge denied the defendant’s motion on March 24, 1988. Carey filed an application for interlocutory appeal of that decision under Mass. R. Crim. P. 15 (b), as amended,
At the time of the events in question, the defendant, a young man seventeen years old about six weeks shy of his eighteenth birthday, was a senior at Woburn High School. On Monday morning, March 9, 1987, two students reported to their industrial arts teacher that Carey had just shown them a gun that he had brought to school in response to an altercation that occurred on the previous Friday afternoon. The teacher promptly relayed the information to assistant principal Paul Sweeney. While the teacher did not tell Sweeney the names of the students who had made the report, he assured the assistant principal that he knew them from having them in his class the past six months, and felt they were reliable.
Sweeney immediately told principal James Foley and housemaster Robert DeLuca of the possibility of a gun on school premises, and the threе administrators decided on a *530 plan of action. 1 They determined to seek out Carey and, if they could find no evidence of a gun in his possession, to search the areas where he had been, and, if that course yielded no gun, to search Carey’s locker.
While these administrators at Woburn High School had never handled a situation in which a student had brought a gun to school, the judge found that they had followed precisely the sаme steps on numerous prior occasions when they had a reasonable belief that a student had brought contraband to school. However, because in this instance the object of the search was either an armed student or a gun, Sweeney, DeLuca, and Foley agreed to take an extra precautionary measure — they called the police. The judge found that the pоlice had no input into the school administrators’ plan, and were notified for safety reasons. 2
Detective Sergeant Robert Scire of the Woburn police department arrived at the high school within ten to fifteen minutes, and he and the school administrators questioned the defendant in a school office. When a search of the defendant and his most recent whereabouts failed to disclоse a gun, DeLuca searched the defendant’s locker. He discovered a dungaree jacket in which he found concealed a sawed-off .22 calibre rifle, a gun sight, a black powdery substance, and a bullet. DeLuca brought the jacket and the gun to Detective Scire.
After advising the defendant of his Miranda rights, the officer showed Carey the jacket and the gun and asked him whether they were his. After an initial disclaimer Carey acknowledged that they were. The judge found that the defendant was alert, calm, responsive, and cooperative in his inter *531 action with the police officer throughout this period, and that he understood and voluntarily waived his Miranda rights. He then denied the motion to suppress.
1.
Search of student’s locker.
Any inquiry into the constitutional validity of the school officials’ conduct must start with an examination whether this action constituted a search to which the Fourth Amendment to the United States Constitution is applicable.
3
As the Commonwealth concedes, school administrators are governmental actors to whose conduct Fourth Amendment strictures apply.
New Jersey
v.
T.L.O.,
The Commonwealth asserts that any expectation of privacy a high school student might have in a locker vis-á-vis school administrators is unreasonable, and thus the Fourth Amendment does not apply. In
New Jersey
v.
T.L.O., supra,
the Supremе Court recognized, but did not decide, the issue of a student’s expectation of privacy in such circumstance.
Id.
at 337 n.5. Most courts that addressed the issue prior to
*532
T.L.O.
concluded that no such expectation of privacy exists because the lockers are school property, made available to students for the limited purpose of storing items legitimately on school premises.
People
v.
Overton,
On the other hand, several courts have expressly held Fourth Amendment standards apply to the search of school lockers.
State
v.
Engerud,
Most courts agree, however, that it is important to consider the effect of a school policy making the lockers subject to search by administrators. Some courts that have held there to be no reasonable expectation of privacy in a school locker have stressed the factor that such a policy exists. Zamora v. Pomeroy, supra at 671. People v. Overton, supra at 524. See also O’Connor v. Ortega, supra at 717 (while public employees have reasonable expectation of privacy in their offices, desks, and file cabinets, these expectations “may *533 be reduced by virtue of actual office practices and procedures, or by legitimate regulation”); 4 W.R. LaFave, Search and Seizure § 10.11(b), at 177 (2d ed. 1987) (“If the school authorities have made it clear that possession of the locker is ‘nonexclusive against the school and its officials,’ . . . the advance notice provides the student with an opportunity to limit the effect of the intrusion by not keeping highly personal materials in the locker provided by the school” [footnotes omitted]).
Although the judge found that the Woburn High School administrators had on several prior occasions searched students’ lockers, as part of an over-all policy when they suspected a student had contraband at school, he made no specific finding whether there had been advance notice of this policy to students.
In the absence of such a specific finding below, we pass over the expectation of privacy issue because we conclude that the warrantless search of the locker was in any event justified under the Fourth Amendment.
In
New Jersey
v.
T.L.O.,
Concerns about school officials’ vital responsibility to preserve a proper educational environment prompted the Court to adopt a reduced constitutional standard to validate student searches. “The special need for an immediate response to behavior that threatens either the safety of schoolchildren and teachers or the educational process itself justifies the Court in excepting school searches from the warrant and probable cause requirement.”
Coffman
v.
State,
The search here not only clearly met such a lesser test, but the facts suggest strongly that probable cause existed as well. On Monday morning, assistant principal Sweeney was told by a teacher, whom hе regarded as extremely diligent and reliable from their eighteen years of working together, that two students in his class had reported to him that the defendant had shown them a gun he had brought to school as a result of the Friday afternoon brawl. The teacher assured Sweeney that he knew the students to be reliable.
Reasonable suspicion of wrongdoing is a “ ‘common-sense conclusio[n] about human behavior’ upon which ‘practical people’ — including government officials — are entitled to rely.”
New Jersey
v.
T.L.O., supra
at 346, quoting
United States
v.
Cortez,
*535
Neither a search of Carey nor a retrаce of his steps through a cafeteria and a classroom turned up the gun the two students reported seeing. On the basis of school administrators’ preexisting knowledge of the defendant’s Friday afternoon brawl and the two students’ eyewitness report of a gun in the defendant’s hands said to be linked to the Friday altercation, together with the failure to find the gun on the person of the defendant or at his most recent whereabouts, housemaster DeLuca’s search of Carey’s locker was clearly
*536
based on common sense, and was reasonable both at its inception and in its scope. See
State
v.
Michael G., supra
at 645-646 (a student’s report to swimming coach, relayed to assistant principals, that defendant had tried to sell him marihuana, provided reasonable grounds for assistant principals’ search of defendаnt’s locker);
Coffman
v.
State,
We affirm the judge’s denial of the defendant’s motion to suppress the sawed-off rifle found within the locker.
2.
The defendant’s inculpatory statements.
The defendant asserts that the Commonwealth failed to prove beyond a reasonable doubt that, given his youth, his waiver of Miranda rights in the absence of either a parent or attorney was knowing and intelligent. See
Commonwealth
v.
A Juvenile,
Although special circumstances must be shown for a waiver of the privilege against self-incrimination by a juvenile to be valid, Commonwealth v. A Juvenile, supra, the defendant in this case was age seventeen years and ten months at the time of his arrest. The defendant concedes that he “was no longer a juvenile,” and indeed was being tried as an adult in this case. In these circumstances, the special scrutiny rules of Commonwealth v. A Juvenile, supra, do not apply.
The standard to be applied to the defendant’s waiver, therefore, is whether it was knowing and intelligent in light of the “totality of the circumstances” leading up to the defendant’s inculpatory statements.
Commonwealth
v.
Mandile,
The motion judge found that the defendant was fully apprised of his Miranda rights, understood them, and made a knowing, intelligent, and voluntary waiver of those rights. A judicial determination regarding Miranda waiver and voluntariness is “entitled to substantial deference by this court.”
Commonwealth
v.
Day,
Nor did the evidence require the conclusion that the defendant’s statement was involuntarily given because it was induced by Detective Scire’s “promise of hope” if he cooper
*538
ated. In reaching a conclusion that a defendant’s statement was voluntarily given, the court looks to whether, in the totality of relevant circumstances, “the defendant’s confession was a free and voluntary act and was not the product of inquisitorial activity which had overborne his will.”
Commonwealth
v.
Allen,
The judge did not find that any promise had been made, . and the evidence was conflicting. Even if the judge had found that Detective Scire told Carey it would be “better” for him to admit to ownership if the jacket and gun were his, the conclusion that the defendant’s admissions were involuntary would not be required. Initiation by the police interrogator of a discussion regarding leniency or a deal for the defendant, if the latter is forthcoming, is one of the many factors taken into consideration in assessing the voluntariness of a defendant’s confession or self-incriminating statement.
Commonwealth
v.
Mandile, supra
at 413. A police officer may not assure the defendant that cooperation “will aid the defense or result in a lesser sentence.”
Commonwealth
v.
Shine,
The denial of the defendant’s motion to suppress is affirmed.
So ordered.
Notes
Prior to being alerted by the teacher of his two students’ reports concerning Carey’s possession of a gun, the school administrators had already been notified by another housemaster, Mr. Curran, of the Friday afternoon brawl between Carey and a former student, whom the administrators all knew.
Assistant principal Sweeney testified that the school administrators were “very, very uptight and very nervous” about the possibility that there was a gun in the school, both for themselves and for the school community of some 1,200 students, and ninety to one hundred employees.
In neither his arguments before the motion judge nor his brief on appeal has the defendant interposed an assertion that the Massaсhusetts Declaration of Rights was violated by either the search or the use of the defendant’s statement to the police. At oral argument, defense counsel stated he assumed he had raised that issue and that, in any event, this court would as a matter of course decide that issue anyway. Because the State constitutional argument was not raised below, we do not consider it here.
Commonwealth
v.
Shine,
Indeed, the eyewitness account of Carey’s possession of a gun at school by two students to a teacher who knew them, may well have constituted probable cause to search Carey’s school locker. These witnesses, or citizen-informants as they have been called, “are subject to much less stringent сredibility verification requirements” than ordinary police informants, since the former generally lack the ulterior motives of the latter.
State
v.
Michael G., supra
at 644.
United States
v.
Gagnon,
In addition to citizen-informers’ first-hand basis of knowledge and presumed credibility, their reports usually arise in urgent situations requiring a prompt response, “so that a leisurely investigation of the report is seldom feasible.” 1 W.R. LaFave, Search and Seizure § 3.4(a), at 718 (2d ed. 1987). The possibility of a gun in the possession of a high school student, in an institution of some 1,200 teenagers and ninety to one hundred adults, certainly presented the Woburn High School administrators with the emergency situation of the typical citizen-informant case. This exigency, together with the probable cause provided by the two students’ reports, probably would have allowed police officers to conduct a search of an area in which the defendant had a reasonable expectation of privacy without a warrant under traditional Fourth Amendment principles.
Commonwealth
v.
Bradshaw,
The defendant has argued that the search of his locker was directed by Detective Scire, and because of the involvement of the police, the probable cause standard rather than the
T.L.O.
standard of reasonable suspicion had to be met to justify the search. See
F.P.
v.
State,
On appeal the defendant for the first time has argued a number of additional grounds for the exclusion of his self-incriminating statements to Detective Scire, none of which he raised before the motion judge, though all were available to him at the time. “Grounds not stated which reasonably could have been known at the time a motion is filed shall be deemed to have been waived.” Mass. R. Crim. P. 13 (a) (2),
