This is an appeal by the Government from an order of the District Court suppressing as evidence a sawed-off shotgun and shotgun shells removed from the defendant's person. A police officer's discovery of these items led to a three-count indictment that charged defendant with possession of an unregistered firearm, 26 U.S.C. 5861(d); a firearm not identified by serial number, 26 U.S.C. 5861(i); and a prohibited weapon, 22 D.C.Code 3214(a). We reverse and remand.

At the suppression hearing, the testimony of the sole witness, Officer Bryant Anderson, Jr., of the Metropolitan Police, set forth the following events. On Saturday, october 7, 1972, at about 8:30 p.m., Officers Anderson and Himes went to the Whitelaw Hotel at 1839-13th Street, N.W., Washington, D.C. The owner of the hotel had requested the police to give special attention to the building 'because of the high crime rate in his building.' (Tr. 7). Officer Anderson's assigned duties had included patrol of the area where the Whitelaw Hotel is located for about two years, and he was able to recognize most of the permanent residents of the hotel. (Tr. 7, 10). When visiting the hotel in response to the owner's requests his usual practice is to inspect the common hallways and lavatories to ascertain whether persons he encounters there have a legitimate purpose in being present in the hotel. Upon meeting a person he does not recognize as a hotel guest, his normal procedure is to ask the person to produce identification and to explain his business in the hotel.

When Officer Anderson was asked whether he searches or frisks individuals he encounters, he replied that he does so 'most of the time, especially in the wintertime when they wear long heavy coats where they can conceal weapons easily.' (Tr. 9-10). The officer added that he is likely to frisk someone 'if the individual cannot give a good explanation of why he is in the building . . ..'

As to the night of October 7, Officer Anderson testified that he and Officer Himes alerted the hotel clerk of their presence and began their inspection of the hotel, starting on the first floor and proceeding to the floors above. They had just started up to the fourth floor when, in Officer Anderson's words--

We just started up the first flight of stairs between the third floor and the landing between the third and fourth floors, about halfway up Mr. Coates came around, came down from the fourth floor, hit the middle landing and was just making the turn to come down that second set of stairs. As he made the turn he spotted myself and Officer Himes. As soon as he saw us he made a quick move to go back up the stairs, run up the stairs. It was quite a jerky move. I yelled to him to hold it. He looked at us for just a split second and shrugged his hands down alongside of his legs and said 'shit', in a disgusted manner. (Tr. 13)

Officer Anderson was asked why he had instructed Mr. Coates to 'hold it.' He replied, 'Mr. Coates looked like he was on the verge of fleeing for some reason unknown to me at that time.' (Tr. 14)Officer Anderson was asked what happened next. He continued:

At that point Mr. Coates had an advantage on me as far as height. My head was approximately belt-level to him which gave him a very good kicking position if he chose to do it. Seeing this advantage, I placed my left hand on his mid-section to walk him back away from the edge of the stairs so I could get even with him. When I did I felt the butt of the sawed-off shotgun tucked down inside of his pants and under his jacket. (Tr. 14-15).

From the contact of his hand against the defendant's jacket, Officer Anderson was confident he had felt the butt of a sawed-off shotgun or rifle. (Tr. 16). Officer Anderson walked the defendant away from the stairs and asked him what was in his pants. When Mr. Coates replied 'nothing,' the officer reached into the defendant's jacket and removed a sawed-off shotgun. The officers thereupon conducted a complete search of the defendant's person and found two shotgun shells in his jacket pocket. The shotgun itself was found to be loaded.

On cross-examination, Officer Anderson further testified that the movement by defendant that preceded the command to stop was not a turning around but 'a quick motion to the right as if to bolt . . .' (Tr. 24). Was Mr. Coates 'free to go' after he was directed to 'hold it'? 'Not until we checked him,' the officer responded. (Tr. 23).

Further questioning of Officer Anderson about placing his hand on the defendant as he ascended the stairs, proceeded as follows (Tr. 32):

Q: Now, when you say that you reached out, did you push him forcefully?

A: No, Sir. Mr. Coates wasn't fighting or causing any immediate danger at that moment. All I did was place my hand on his stomach above the belt-level in order to protect myself as far as a kick or a movement trying to run me over and back him back.

Q: Would you have done that with any individual in the Whitelaw Hotel, any male that you had come in contact with under those circumstances?

A: Yes, Sir, I would have.

Would he have frisked the defendant had he not felt a weapon at the initial touching? Officer Anderson replied 'possibly not,' noting that the defendant's clothing was not bulky and that he saw no bulges. When defense counsel asked whether prior to the initial physical contact he had reason to fear that Mr. Coates was armed, the officer responded 'I am always in fear that someone is armed.' (Tr. 33-34).

Asked by the Court whether he had been kicked by someone standing at a higher level, Officer Anderson answered that such an incident had occurred some three-and-a-half years earlier, when he was responding to a disorderly person call.

After the foregoing testimony the District Court ruled on January 26, 1973, that it would grant the motion to suppress. Its ruling is in the margin.1

The Government asked the District Court for a ruling that was more specific as to the ground on which the evidence was suppressed. The Court complied with the request, stating on February 2, 1973:

. . . I find and conclude that the defendant was under arrest as the officer stated.

He said he would not let him move and he would not permit him to leave and that he acted without probable cause and found a transient on the steps and said he thought he was going to be kicked so he put his hand up and definitely that man was under arrest. He could not move. He did not use the word 'arrest.'

I find no probable cause for arrest and the search was as a result. (Supp. Tr. 3).

The District Court's ultimate ruling reflects a legal conclusion that Officer Anderson placed the defendant under arrest when he told the latter to 'hold it,' and that this action violated the Fourth Amendment unless supported by probable cause.2 This conclusion was erroneous. Ever since Terry v. Ohio, 392 U.S. 1, 88 S. Ct. 1868, 20 L. Ed. 2d 889 (1968), Fourth Amendment jurisprudence has recognized a variety of police encounters with citizens which limit personal freedom but do not amount to arrests. These lesser intrusions, including 'stops' and 'frisks,' are constitutional even in the absence of probable cause required for arrest so long as they satisfy the test of 'reasonableness,' ascertained by balancing the Government interest further by police action against the invasion of individual privacy. 392 U.S. at 20-21, 88 S. Ct. 1868. The latest word on this kind of police activity appeared in Adams v. Williams, 407 U.S. 143, 92 S. Ct. 1921, 32 L. Ed. 2d 612 (1972), where the Supreme Court held that a police officer may constitutionally detain a person 'to determine his identity or to maintain the status quo momentarily while obtaining more information,' expressly viewing such an action as a forcible, but temporary, detention. 407 U.S. at 146, 92 S.Ct. at 1923. Because the District Court erroneously measured Officer Anderson's action against the probable-cause-to-arrest standard, we must reverse.

The Government asks us to go further and rule that throughout his encounter with the defendant, Officer Anderson acted reasonably, both in ordering the defendant to stop and in placing his hands upon the defendant's midsection, the gesture which led to discovery of the concealed firearm. Such a determination, however, must await further examination by the District Court. We say this having in mind that although the District Judge erred in saying in his supplementary statement that there was a need for probable cause to support an arrest, what he may have had in mind was a conviction that under the totality of the circumstances the police officer acted unreasonably. Our remarks should not be taken as any indication of spproval or disapproval of such a conclusion. Rather, we think that an appellate ruling should be preceded by further reflection on the underlying problems by counsel and by the trial judge.

This case requires a further fleshing out of the justification required by the Fourth Amendment for various encounters between police and citizens. Terry and Adams dealt with a police officer's constitutional power to detain suspects, and to disarm them, under circumstances suggesting the commission of a particular crime. Cases in this circuit since Terry have involved similarly suspicious circumstances.3 But police encounters with citizens are not all of a single kind. They are, as the Supreme Court observed in Terry, 'incredibly rich in diversity.' 392 U.S. at 13, 88 S. Ct. 1868. Analysis is not aided by labelling them all as 'stops.' Encounters very in the degree of intrusion; plainly there is a difference between an order to stop and give identification and a command to remain in a certain place for questioning for as long as twenty minutes.4 And although some restraint and constraint may be present whenever police officers confront citizens to ask questions, see Allen v. United States, 129 U.S.App.D.C. 61, 391 F.2d 476 (1968), such encounters differ in their potential for intimidation and abrasion.5 Delineation of the Fourth Amendment limitations on police investigative activity 129 U.S.App.D.C. 61, 390 F.2d 476 differences.6

Plainly the circumstances under which Officers Anderson and Himes met the defendant, as they appear in this record, are less supportive of suspicion of criminal conduct than the circumstances we have encountered in our previous cases.7 Without implying that the same degree of suspicion is required to justify the police officers' actions in this case, we note that our remand provides an opportunity to the Government to supplement its evidentiary presentation, focusing on any further facts which explain the officers' particular response. In addition, the remand will give the Government an opportunity to clarify whether it relies upon a police authority to respond to particular suspicious circumstances and threats of crime present here, or upon a more generalized police power to stop persons momentarily and ask their business.8

There is in this case the additional fact of Officer Anderson's placing his hands on the defendant. The Government makes the point that this action was not a full-fledged pat-down for weapons, which the Supreme Court has indicated is not necessarily justified in all situations where an officer may detain for investigation. Adams v. Williams, supra, 407 U.S. at 149, 62 S. Ct. 1921. Yet an assessment of the reasonableness of police action must reflect an awareness that non-consensual physical contact represents a special intrusion into a person's privacy. The mere fact that an officer may reasonably stop someone to ask questions does not necessarily make it reasonable for the officer to lay his hands on the person involved. Sanctity of the person is a concern of the law generally, and a special concern of the Fourth Amendment in particular.

Fourth Amendment jurisprudence involves prudence for the police as well as fairness for citizens. A police officer 'need not defer . . . protective measures to the point of peril.' Young v. United States, supra,435 F.2d at 409. Courts must be careful not to use hindsight in limiting the ability of police officers to protect themselves as they carry out missions which routinely incorporate danger.9 On the other hand, law enforcement officers must be sensitive to the rule that requires an articulable justification under the circumstances for laying their hands on a citizen; scrutiny of that justification must include such matters as whether less intrusive protective measures were available and unreasonably ignored. Officer Anderson's testimony in this case that he is 'always in fear that someone is armed' properly reflects the need for police to be prepared for any contingency, but it does not support a routine authority to conduct a pat-down of any and all citizens a policeman encounters.

The judgment is reversed and the case remanded for further proceedings not inconsistent with this opinion.

So ordered.