The People have an obligation to disclose exculpatory evidence in their possession that is favorable to the defendant and material to his or her guilt or innocence … . “The prosecutor’s duty to exchange Brady material extends to the disclosure of evidence that can be used to impeach the credibility of a witness for the People whose testimony may be determinative of the defendant’s guilt” … . In order to establish a Brady violation, a defendant must prove: (1) the evidence at issue is favorable to him or her, (2) the evidence was suppressed by the prosecution, either willfully or inadvertently, and (3) prejudice arose because the suppressed evidence was material … .

Here, the crucial evidence against the defendant at trial was his statement admitting to the shooting, taken by Detective Ronald Tavares. There was no physical evidence connecting the defendant to the crime, and the eyewitnesses could not identify him. Given the importance of Detective Tavares’ testimony in establishing the defendant’s guilt, the Supreme Court properly determined that evidence concerning allegations that he had procured a false confession in an unrelated matter involving two police officers, which led to an internal affairs investigation of those officers and a federal lawsuit against, among others, Detective Tavares, was favorable to the defense and material … . The evidence was responsive to a defense demand and there is a reasonable possibility that the outcome of the trial would have differed had the evidence been produced … . Furthermore, the defendant sufficiently established that the prosecutor had actual knowledge of the allegations against Detective Tavares and the related investigation in the unrelated matter … . People v Hubbard, 2015 NY Slip Op 07858, 2nd Dept 10-28-15

The prosecutorial misconduct during the voir dire questioning and cross-examination of the defense’s expert included statements that the expert had repeatedly lied to judges in other cases and during his testimony in the instant case. In addition, the prosecutor presented himself as an unsworn witness at the trial, suggesting that he had been present at the trial of another case at which the defendant’s expert had lied. The prosecutor furthermore repeatedly questioned another defense witness about lying. The cumulative effect of this misconduct … unfairly deprived the defendant of the ability to present his defense of extreme emotional disturbance to the charge of murder in the second degree … . People v Martinez, 2015 NY Slip Op 03568, 2nd Dept 4-29-15

The prosecutor improperly functioned as an unsworn witness when she cross-examined the defendant regarding the closing time of a restaurant in Brooklyn … .  The police officers who conducted the traffic stop testified on their direct examinations that the traffic stop occurred at 9:35 p.m. On his direct examination, in contrast, the defendant testified that the traffic stop occurred between 8:00 p.m. and 8:30 p.m., while he and the other occupants of the vehicle were on their way to a restaurant in Brooklyn. During the prosecutor’s cross-examination of the defendant, she improperly suggested facts not in evidence when she implied that the District Attorney’s office had called the restaurant to ascertain its hours of operation, and asked the defendant whether he testified that the traffic stop occurred between 8:00 p.m. and 8:30 p.m. because he knew that the restaurant was not open at 9:35 p.m. … . During summation, the prosecutor again improperly implied, without having submitted any evidence about the closing time of the restaurant, that the defendant had lied about what he was doing at the time of the traffic stop … .

Further, the prosecutor made improper remarks during summation which suggested that the defendant possessed the weapon with an intent to use it to harm someone, even though this was not an element of the crime for which the defendant was on trial … . Similarly, the prosecutor’s questioning of the defendant about one of his tattoos was improper and led to the inflammatory and unsupported inference that the defendant had previously used the weapon to harm someone … . It was also improper for the prosecutor to argue during summation that the defendant had learned certain information during the pretrial hearing even though there was no evidence to support this assertion … .

In addition, the prosecutor’s statement during summation that the defendant did not make any sudden movements during the traffic stop because he had already “played out this exact scenario in his mind . . . every time he left his house with that gun” was improper speculation, without any basis in the record, that the defendant had committed multiple gun possession offenses prior to the subject incident which led to his arrest … .People v Rowley, 2015 NY Slip Op 02988, 2nd Dept 4-8-15

…[T]he People properly elicited testimony from his girlfriend during cross-examination regarding her delay in coming forward to the authorities with certain exculpatory information. Before a defense witness may be cross-examined regarding his or her failure to come forward with exculpatory information at an earlier date, certain foundational requirements must first be met … . Here, the prosecutor laid the necessary foundation prior to cross-examining the defendant’s girlfriend about her apparent delay in informing law enforcement authorities of the defendant’s alibi. The record indicates that, during a bench conference, it was ascertained that the defendant’s girlfriend had not refrained from speaking to authorities under the advice of defense counsel. Moreover, the court instructed the jury that the defendant’s girlfriend had no obligation to volunteer exculpatory information to law enforcement authorities. Under these circumstances, the People properly elicited evidence during the cross-examination of the defendant’s girlfriend that she delayed in contacting the authorities with exculpatory evidence … . People v Webster, 2015 NY Slip Op 01974, 2nd Dept 3-11-15

…[T]he prosecutor improperly elicited testimony from a police investigator that he had received training establishing that underaged victims of sexual crimes frequently disclosed the crime in minimal detail at first, and provided more thorough and intimate descriptions of the event later. That testimony dovetailed with the People's position concerning the way in which the victim revealed this incident … . Thus, we conclude that the investigator's testimony “was the precise equivalent of affirming the credibility of the People's witness through the vehicle of an opinion that [sexual abuse is frequently committed] as the victim had related. It is always within the sole province of the jury to decide whether the testimony of any witness is truthful or not. The jurors were fully capable of using their ordinary experience to test the credibility of the victim-witness; and the receipt of the [investigator]'s testimony in this regard was improper and indeed constituted usurpation of the function of the jury . . . Where, as here, the sole reason for questioning the expert' witness is to bolster the testimony of another witness (here the victim) by explaining that his version of the events is more believable than the defendant's, the expert's' testimony is equivalent to an opinion that the defendant is guilty” (People v Ciaccio, 47 NY2d 431, 439), and the prosecutor improperly elicited that testimony.

Moreover, by eliciting that testimony, the prosecutor improperly introduced expert testimony regarding the Child Sexual Abuse Accommodation Syndrome. Although such testimony is admissible in certain situations …, here it was elicited from a police investigator under the guise that it was part of the investigator's training. The prosecutor failed to lay a foundation establishing that the investigator was qualified to provide such testimony …. Furthermore, the evidence does not establish that the investigator had “extensive training and experience [that] rendered [him] qualified to provide such [testimony]” … . People v Scheidelman, 2015 NY Slip Op 01111, 4th Dept 2-6-15

The trial court properly precluded the defendant from cross-examining one of the complaining witnesses regarding a notarized statement which she had denied signing, and for which the notary could not be located. “[T]here must be a proper foundation laid for the introduction of prior inconsistent statements of a witness. In order to prevent surprise and give the witness the first opportunity to explain any apparent inconsistency between his [or her] testimony at trial and his [or her] previous statements, he [or she] must first be questioned as to the time, place and substance of the prior statement” … . “If the witness does not admit that he [or she] signed the statement[ ], the genuineness of the signature can be proved by any one or in any legal way. Such proof enables the impeaching party to properly offer the paper in evidence as a part of his [or her] case or, with the permission of the court, at any other stage of the trial” … . Where, as here, the party seeking to admit the writing into evidence has not proven the genuineness of the signature, “the writing cannot be read to the jury, or, provided it can be produced, used as a basis for a cross-examination as to its contents until it is in evidence'” … . People v Haywood, 2015 NY Slip Op 00555, 2nd Dept 1-21-15

The People sought the court’s permission to cross-examine defendant about a previous guilty plea to a charge of harassment in the second degree based upon defendant’s physical altercation with another woman, maintaining that such questioning would be useful to, among other things, impeach defendant’s credibility. Despite defendant’s objection that such line of questioning would have no probative value, the court allowed the proposed cross-examination, stating that such evidence of defendant’s previous assault was “relevant” to “show that [defendant] can be physically aggressive” and, additionally, that such proof would speak to defendant’s anticipated testimony that she had acted in self-defense. The court went on to indicate that the admission of such evidence would not unduly prejudice defendant inasmuch as the prior incident did not involve a weapon or result in serious physical injury.

Based upon County Court’s authorization, the People cross-examined defendant at trial about the previous altercation, suggesting that defendant had instigated the fight and, further, emphasizing that defendant punched the woman with a closed fist, causing her to lose a tooth. Moments later, the People resumed its questioning about the altercation with the victim, asking defendant whether she baited the victim to come up to her apartment knowing that she would use a knife in a fight with the victim. As the questions regarding defendant’s prior assault bore no relation to defendant’s credibility, but rather served solely to illustrate defendant’s propensity to initiate fights so that she could physically attack other people, we find that County Court abused its discretion in allowing such inquiries … . Accordingly, as defendant’s guilt was not overwhelmingly established by the proof presented at trial and we “cannot say that there is no reasonable possibility that the error might have contributed to defendant’s conviction,” the judgment must be reversed and the matter remitted for a new trial … . People v Karuzas, 2015 NY Slip Op 00252, 3rd Dept 1-8-15

The witness’s service as an informant had concluded a year before the instant crime and did not involve defendant, the People demonstrated that the witness had legitimate safety concerns regarding disclosure of her status, and there was nothing in the circumstances of the case to raise a suspicion that her past informant status contributed to her becoming a prosecution witness in this case. People v Lopez, 2014 NY Slip Op 08117, 1st Dept 11-20-14

Absent “unusual circumstances,” evidence of a defendant’s silence at the time of arrest is generally inadmissible under common-law evidentiary principles … . And the use for impeachment purposes of a defendant’s silence after receiving Miranda warnings has been deemed impermissible as a matter of due process … . Under the circumstances presented, we conclude that defendant did not open the door to evidence of his post-Miranda silence and, therefore, Supreme Court erred in permitting its introduction at trial. Nor can the error be viewed as harmless in this case.  People v Hill, 2014 NY Slip OP 07925, CtApp 11-18-14