Because of the use of evidence obtained by an unlawful search we must again reverse a conviction, this time of housebreaking and larceny, which otherwise might be sustained. We restate the basic principles. The Fourth Amendment prohibits an unreasonable search.1 A search is unreasonable unless authorized by a valid search warrant, is incident to a valid arrest, or is made in other exceptional circumstances which dispense with the need for a search warrant. United States v. Jeffers, 342 U.S. 48, 72 S.Ct. 93, 96 L.Ed. 59; United States v. Rabinowitz, 339 U.S. 56, 70 S.Ct. 430, 94 L.Ed. 653; Johnson v. United States, 333 U.S. 10, 68 S.Ct. 367, 92 L.Ed. 436. And see Giordenello v. United States, 357 U.S. 480, 78 S.Ct. 1245, 2 L.Ed.2d 1503, and Jones v. United States, 357 U.S. 493, 78 S.Ct. 1253, 2 L.Ed.2d 1514. A search, either with or without a warrant, is also unreasonable when made merely for evidentiary material which “was not the instrument or means by which the crime was committed, the fruits of a crime, a weapon by which escape might be effected, or property the possession of which is a crime.” Morrison v. United States, 104 U.S.App.D.C., -, 262 F.2d 449. Evidence obtained by an unreasonable search may be, and when adequately objected to must be, excluded on the trial of the person whose right of privacy has been violated. Weeks v. United States, 232 U.S. 383, 34 S.Ct. 341, 58 L.Ed. 652; Silverthorne Lumber Co. v. United States, 251 U.S. 385, 40 S.Ct. 182, 64 L. Ed. 319; United States v. Jeffers, supra.
In the case before us none of the conditions for a reasonable search existed. There was no search warrant and no arrest. No exceptional circumstances are advanced to justify a search without a warrant. Moreover, the search was for evidentiary material within the meaning of Morrison v. United States, supra.
The evidence was that of a police officer obtained by his search of a clothes closet in an apartment. The apartment was described by the officer himself as appellant’s home.2 A written motion to suppress was filed shortly prior to trial. On argument of the motion it developed that the officer was “admitted to the home” and would testify that he observed a coat from which there was missing a button which the prosecution claimed had been recovered at the scene of the crime.
*489The court refused to suppress the evidence, apparently on the ground that it was obtained visually and not physically seized.3 We are cited to no decision holding, and we can think of no reason why, such evidence is not subject to the rule excluding evidence obtained by an unlawful search. The purpose of the rule, see McDonald v. United States, 335 U.S. 451, 455, 456, 69 S.Ct. 191, 93 L.Ed. 153, covers this case as though the coat itself with the missing button had been illegally seized and offered in evidence.
“We find no basis in the cases or in logic for distinguishing between the introduction into evidence of physical objects illegally taken and the introduction of testimony concerning objects illegally observed. We are aware of no case which makes this distinction.”
McGinnis v. United States, 1 Cir., 227 F.2d 598, 603. And see Silverthorne Lumber Co. v. United States, supra, 251 U.S. at pages 391-392, 40 S.Ct. at page 182.
The Government suggests on the appeal that the motion to suppress was properly denied because there was no dispute the officer was admitted to the apartment. Admittance to the apartment, however, did not carry with it consent to a search therein. The facts developed at the trial plainly fail to show such consent and it is not to be presumed. The officer testified that appellant’s sister answered his knock at the door and admitted him when he stated, “May I come inside and talk to you * * I don’t want to discuss my business out in the hallway, let’s go inside where its private.” This “admittance” simply is not in fact or in law a consent to a search of the apartment.
The question arises whether after this admittance of the officer the sister went further and gave him permission to search the clothes closet. We need not resolve the question whether she had authority to permit a search of the closet where appellant kept his clothes, see, e.. g., Amos v. United States, 255 U.S. 313, 41 S.Ct. 266, 65 L.Ed. 654, United States v. Blok, 88 U.S.App.D.C. 326, 188 F.2d 1019, for the testimony fails to show permission to do so. Indeed, the officer did not say he was given permission to search the closet. On his direct examination he testified:
“I went to the defendant’s home. * * * I identified myself as a police officer and his sister admitted me into the house. It is an apartment.”
On his cross-examination the following occurred:
“Q. [Defense Counsel]: Did she give you permission to search the apartment ?
“[Assistant United States Attorney] : I object, once the admission has been made that he entered the apartment, I don’t think this is material.
“The Court: Sustain the objection.
“The Witness: She had no objections to my entering the apartment, no.”
When the sister testified the following occurred:
“A. [The sister] * * * [The officer] came to my apartment and asked me to let him come in. So I did and he asked me that he wanted to take a look at Harry’s clothes. So, by me not knowing, I just let him come in and he looked through Harry’s clothes.
“Q. Did he tell you you could refuse to let him in if you wanted to?
“A. No.
“Q. Why did you let him in?
*490“[Assistant United States Attorney] : I object.
“The Court: Objection sustained.”
Not only was it error to cut off counsel’s efforts to develop the circumstances attending the search, but the evidence shows no such consent to any search in the apartment as meets the test laid down by this court in Judd v. United States, 89 U.S.App.D.C. 64, 66, 190 F.2d 649, 651, where it is said:
“[S]uch a waiver or consent must be proved by clear and positive testimony, and it must be established that there was no duress or coercion, actual or implied. Amos v. United States, 255 U.S. 313, 41 S.Ct. 266, 65 L.Ed. 654; United States v. Kelih, D.C.S.D.Ill.1921, 272 F. 484. The Government must show a consent that is ‘unequivocal and specific’ (Karwicki v. United States, 4 Cir., 55 F.2d 225, 226), ‘freely and intelligently given.’ Kovach v. United States, 6 Cir., 53 F.2d 639. Thus ‘invitations’ to enter one’s house, extended to armed officers of the law who demand entrance, are usually to be considered as invitations secured by force. United States v. Marquette, D.C.N.D.Cal.1920, 271 F. 120. A like view has been taken where an officer displays his badge and declares that he has come to make a search (United States v. Slusser, D.C.S.D.Ohio 1921, 270 F. 818), even where the householder replies ‘All right.’ United States v. Marra, D.C.W.D.N.Y.1930, 40 F.2d 271. A finding of consent in such circumstances has been held to be ‘unfounded in reason’. Herter v. United States, 9 Cir., 27 F.2d 521.”
Nor will it do to say that the use on the trial of the illegally procured evidence must be overlooked because not the subject of an adequate objection. As we have seen, there was a formal motion to suppress the evidence. • This motion was entertained by the court prior to trial in accordance with Rule 41(e) Fed.R.Crim.P., 18 U.S.C.A. Though the facts were not then developed as fully as desirable this must be attributed largely to the position taken by the prosecution, and adopted by the court, that the motion should be denied because no physical evidence was obtained by the search. Since this position was erroneous, and since the admittance of the officer to the apartment to continue his conversation with the sister did not constitute consent by her to a search, the motion was erroneously denied. Subsequent developments at the trial, as we have already seen, did not serve to cure the error. Moreover, when the prosecution at the trial first opened the matter of the search the following occurred:
“[Assistant United States Attorney, in questioning the officer] : Did you make any search of the apartment with regard to the button which you had found prior at the house of Doctor Becker [where the theft had occurred] ?
“[Defense Counsel]: I object to that, if the Court please.
“The Court: Overruled.”
Even if objections were not precisely and unambiguously made, they were sufficiently made. Indeed, since plain er-xors affecting substantial rights are involved, we should pass upon the issues even in the absence of any objection. Rule 52(b) Fed.R.Crim.P.
It is urged, finally, that the evidence had slight if any effect. This indicates no more than a conviction might well have been obtained by the use only of legal evidence. It does not follow that when evidence procured by the violation of a constitutional right is used the resulting conviction can be affirmed. To so hold would destroy the well settled rule under which such evidence is excluded in aid of the enforcement of the Fourth Amendment. See Agnello v. United States, 269 U.S. 20, 35, 46 S.Ct. 4, 70 L.Ed. 145; Kremen v. United States, 353 U.S. 346, 77 S.Ct. 828, 1 L.Ed.2d *491876; Bynum v. United States, 104 U.S. App.D.C.-, 262 F.2d 465.
Reversed and remanded.
. “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. IY.
. The apartment was occupied by the appellant, liis sisters, his mother, and his two children.
. The prosecution stated its objection, aside from untimeliness in the filing of the motion, to be “on the theory that the Government has no evidence which it intends to produce in this ease that was taken from the premises of the defendant. There was evidence seen at his premises but none recovered. Consequently, the motion to suppress would not lie.”