William Colon appeals from a judgment of conviction after bench trial in the United States District Court for the Southern District of New York (Kaplan, J.). He challenges the denial of his motion to suppress physical evidence and statements recovered during a stop and frisk. The sole question on appeal is whether caller information given to a civilian 911 operator working for the New York Police Department but not conveyed to the dispatching or arresting officer can be imputed to the arresting officer under the collective knowledge doctrine as a basis for reasonable suspicion to justify the search. For the reasons discussed below, Colon’s conviction is vacated and the case is remanded for further proceedings.
I. Background
At 6:12 a.m. on February 6, 2000, a New *132 York City 911 operator 2 received a call from a woman who stated that she was outside an after-hours club at 1735 Rose-dale Avenue in the Bronx and that “there’s a guy inside that has a gun, and he hit me over the head with it, okay. It didn’t, I’m not bleeding or anything, but he has a gun and he’s dangerous, okay?”. The caller also stated that “[h]e’s male, okay, he’s Hispanic but he looks white. He’s got a red hat, a red baseball cap and a red leather jacket, okay? ... I guess he’s Hispanic but he looks white. They call him White Boy. That’s, he looks white. He’s white.” When asked if she wanted to leave her name and number, the caller stated “I don’t care -because he already hit me one time and Officer Alejandro has my report on him.... And, but I just don’t want him to know that I was the one that called.”
After some confusion about the address, the caller clarified that she was calling from 1735 East 172nd Street, between Noble Avenue and Rosedale Avenue. The caller also stated that she would not be there when the officers arrived because “I don’t want him to see me. He’s a drug dealer. I don’t want to get killed. You understand? ... And this is the same guy that hit me over the face and I got 15 stitches like three weeks ago.” The caller continued: “So they know. The cops know about the incident, so I don’t have to give you my name. They know who I would be. You understand? ... If I leave you my name, and they start saying my name over there. I don’t wanna be, you know, I don’t want no problems because I have three children and I don’t want to take no kind of risk.” The 911 operator informed her that an officer would be sent. The call lasted six minutes.
The 911 operator then made an entry into the computer system used to transmit call information to the NYPD dispatcher. The 911 operator’s computer entry described the incident as a code “10-10” (a crime in progress) and included the location, a description of the suspect as a male Hispanic wearing a red hat and red leather jacket with the nickname “White Boy,” and the facts that the suspect had a firearm and that the tip had come from an anonymous caller on a Sprint Spectrum cell phone, also listing the number.
The dispatcher then made a radio call for officers to respond to a “man with a gun case” at 1735 East 172nd Street. The dispatcher told the officers in the field that
It states ah male, Hispanic, in a after-hours spot. His name, it states, um, male Hispanic, name is ‘White Boy.’ He’s wearing a red hat with a red leather jacket. It’s anonymous. There’s no call back at this time. Still waiting for, from the operator. Unit come back.
The dispatcher then told the field officers that “this call back is a cellphone. No further information.”
Acting on the information provided by the dispatcher, two NYPD officers, Claude Rhone and Sean Smith, proceeded to the club. Inside the club, they observed Colon wearing a red leather jacket and a red baseball hat. Colon was not seen to engage in suspicious activity and there was no evidence that any criminal activity had occurred. Officer Rhone approached Colon, stopped and frisked him, and found a Bryco 9mm semi-automatic pistol in Colon’s waistband. Colon was then arrested. He subsequently made a video-taped state *133 ment in which he acknowledged that he had possessed the gun.
II. Proceedings below
Colon moved to suppress the gun and his statement on the ground that the tip from the anonymous caller did not provide the officers with reasonable suspicion to stop and frisk him, under
Florida v. J.L.,
Acknowledging that this was a “close call,” the district court denied the motion to suppress because the tip leading to defendant’s arrest had sufficient indicia of reliability to establish reasonable suspicion, and unlike the call in J.L., was not “truly anonymous,” as the caller “gave information to the police that she believed would have enabled the police to determine her identity and location.... The critical point for purposes of this determination is that the caller gave information which, on the face of it, indicates that she believed she was identifiable to the police.” United States v. Colon, 111 F.Supp.2d 439, 442 (S.D.N.Y.2000). The district court also noted that the caller “made it clear that she had a very sound reason for refusing to give her name during the 911 call, despite the fact that she believed that the police, in due course, could track her down,” by reference to her recent assault report. Id. In addition, the district court distinguished J.L. in that this call was recorded, thus avoiding the problem of reconstructing the nuances of hurried communications after the fact. Id. at 442-43. Finally, the court observed, “here it is crystal clear that the caller had first hand knowledge of the alleged criminal activity.” Id. at 443. Under these circumstances, the court had “no doubt that the tip provided adequate first hand knowledge of a crime and was sufficiently reliable to establish reasonable cause to stop and search the defendant.” Id. Defendant does not dispute these conclusions.
The district court then determined that if the call had been received by a police officer, the stop and frisk would be permissible because the information received by the officer answering the phone would be sufficient to find the existence of reasonable suspicion and would be imputed under the collective knowledge doctrine to the dispatched officers who stopped Colon. Id. Defendant does not dispute this conclusion either.
Lastly, the district court concluded that although the civilian 911 operator was not a trained law enforcement officer, her knowledge could be imputed to law enforcement personnel because application of the imputed knowledge doctrine turned “not on the characteristics of the personnel among whom knowledge is imputed, but rather involve[s] practical assessments driven by the overall requirement of reasonableness.” Id. at 444. Considering the practical necessity of imputing knowledge among law enforcement personnel, the enormous cost of paying trained police officers to serve as 911 operators in a city the size of New York City, and the high volume of traffic through the 911 response center, the trial' court concluded that the fact that the 911 operator was a civilian rather than a law enforcement officer did not render the stop and frisk unreasonable. See id. at 445. It is this critical conclusion that forms the basis of defendant’s argument on appeal that the additional knowledge of the civilian 911 operator never conveyed to the dispatcher cannot be imputed to the dispatcher or the arresting officers, and that absent *134 that additional information, those officers lacked reasonable suspicion to search Colon.
After denial of his motions to suppress, Colon consented to a bench trial on stipulated facts to preserve the suppression issue for appeal, and was convicted of being a felon in possession of a firearm, in violation of 18 U.S.C. § 922(g)(1).
III. Discussion
A. Reasonable suspicion
The Fourth Amendment states that the “right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated.” U.S. Const., Amend. 4. “Its ‘central requirement’ is one of reasonableness.”
Illinois v. McArthur,
In
Terry v. Ohio,
In
Florida v. J.L.,
The parties to this appeal agree that without the additional information known by the 911 operator, the stop and frisk would have been impermissible under
J.L.,
B. Collective knowledge
Under the collective or imputed knowledge doctrine, an arrest or search is permissible where the actual arresting or searching officer lacks the specific information to form the basis for probable cause or reasonable suspicion but sufficient information to justify the arrest or search was known by other law enforcement officials initiating or involved with the investigation.
See United States v. Hensley,
The collective knowledge doctrine was developed in recognition of the fact that with large police departments and mobile defendants, an arresting officer might not be aware of all the underlying facts that provided probable cause or reasonable suspicion, but may nonetheless act reasonably in relying on information received by other law enforcement officials.
See Whiteley v. Warden, Wyoming State Penitentiary,
The Government views this case as analogous to the flyer or bulletin cases in which probable cause for arrest was predicated on information known only by the police department that issued the flyer or bulletin. It argues that here the NYPD “as a whole” possessed sufficient information to support the stop and frisk. However, by not tracing the information back to any person with the training to make a determination of reasonable suspicion and relying instead on the collective knowledge of “the department” generally, the government’s argument takes the collective knowledge doctrine too far afield of the reasons underlying its purpose.
A primary focus in the imputed knowledge cases is whether the law enforcement officers initiating the search or arrest, on whose instructions or information the actual searching or arresting offi
*136
cers relied, had information that would provide reasonable suspicion or probable cause to search or arrest the suspect.
See Hensley,
The two cases cited by the government imputing to an arresting officer the knowledge of a non-police officer both involved individuals with other specialized law enforcement training: an assistant district attorney,
Calamia v. City of New York,
In
Rosario,
the New York court of appeals considered whether to extend New York’s “fellow officer” rule, analogous to the collective knowledge doctrine, to information known to an auxiliary police officer assisting with the arrest of a suspect. The rule, permitting police to act on information received by fellow officers or departments, relies on the presumption that the “officer or department furnishing that information ... possesses the requisite probable cause to justify the warrantless arrest.”
Id.
at 588,
In contrast, the record here contains no evidence of whether or how 911 operator training is directed in any way to developing that ability, and thus contains nothing from which to conclude that the operator taking the call was capable of determining whether reasonable suspicion for the stop and frisk existed. The government has pointed to no cases imputing the knowledge of a person with no apparent training in assessing probable cause or reasonable suspicion to an arresting officer, and the Court’s research reveals none. In the absence of any showing that any NYPD employee with the training, responsibility or authority to make a determination of reasonable suspicion ever had sufficient information on which to effect or instigate the stop and search of Colon, this Court cannot find that the Terry stop was reasonable.
Moreover, the government does not suggest that the NYPD dispatcher claims to have relied on any 911 operator assessment of the existence of reasonable suspicion when directing the field officers to the after hours club. Imputing information known only to the civilian operator and not conveyed to the dispatching and then arresting officers would extend the doctrine beyond its current jurisprudential parameters and vitiate the privacy safeguards of the Fourth Amendment and their requirement that an officer may conduct a
Terry
stop only if the officer has “a reasonable suspicion supported by articulable facts,”
United States v. Sokolow,
The government also does not argue that the arresting officers acted in objectively reasonable reliance on some assessment of reasonable suspicion made by the dispatcher, and as the record shows that the dispatcher did not direct the officers to search the defendant and made clear to the arresting officers that he had conveyed all the information he had received from the 911 operator, the record would not support such an assertion. This case thus
*138
presents the inverse of
United States v. Santa,
Finally, our determination here that the Tern/ stop conducted on February 6, 2000 violated Colon’s Fourth Amendment rights because the information used by law enforcement officers as the basis for the search was constitutionally inadequate will not impair law enforcement operations in New York City, nor will it require New York to abandon the use of civilian 911 operators, two valid concerns voiced by the district court. It is important to emphasize that the source of the problem is not the fact that the operator was a civilian. The problem is two-fold: the 911 operator’s knowledge could not be imputed to the dispatcher because the operator lacked the training to assess the information in terms of reasonable suspicion, and the operator failed to convey sufficient information from which the dispatcher, a law enforcement officer, could have concluded that a stop and frisk could be ordered, or from which the arresting officers could have concluded that a stop and frisk was appropriate. This problem presumably can be avoided by training 911 operators as to (i) the standards for evaluating the sufficiency of incoming information, or (ii) the type of information needed by law enforcement personnel and the importance of conveying this information to them, or (iii) both. Moreover, even under the circumstances here, the field officers who received the information from the dispatcher, knowing that it alone would not support a search of the suspect, nonetheless could have gone to the scene, ready to make their own trained observations and to take immediate action should the suspect’s conduct give them reason to search. This course would serve the interest of public protection without running afoul of the Constitution.
Conclusion
For the foregoing reasons, Colon’s conviction is vacated, and the case is remanded for further proceedings consistent with this opinion.
Notes
. In New York CiLy, 911 operators are not police officers but rather civilian employees of ihe New York Police Department ("NYPD”).
. Other circuits have applied the collective knowledge doctrine where no single officer has the requisite knowledge to supply probable cause or reasonable suspicion but two or more officers working closely on the investigation together have sufficient information.
See, e.g., United States v. Edwards,
