delivered the opinion of the Court.
In
State v. Cain,
224
N.J.
410,
Expert testimony that a defendant possessed a controlled dangerous substance with the intent to distribute is nothing less than a pronouncement of guilt by mimicking the statutory elements of the offense.
Id.
at 427,
The case before us involves a joint trial of defendant and a co-defendant, both charged with and convicted of a number of
We conclude that the admission of the expert testimony constituted plain error because it violated principles set forth in this Court’s recent jurisprudence, including principles on which we further elaborated in Cain. The erroneously assumed fact in the hypothetical question — that the object in defendant’s hand was a bundle of heroin packets — unfairly buttressed the State’s case. It was for the jury to decide the identity of the object based on an examination of the totality of the evidence. The ultimate-issue testimony on conspiracy, moreover, impermissibly intruded into the jury’s singular role as trier of fact. We are therefore compelled to reverse the judgment of the Appellate Division, vacate defendant’s convictions, and remand for a new trial.
I.
A.
Defendant Yasin Simms and co-defendant Monae Butcher were tried jointly on various drug charges enumerated in an Atlantic County indictment. At trial, the State elicited the following testimony relevant to this appeal.
On September 15, 2009, while conducting a drug surveillance of a public housing project in Atlantic City, Detective Michael Ruzzo of the Atlantic City Police Department observed a four-door silver car park alongside a curb near the project. The driver of the car, later identified as Sean Atkinson, reclined in his seat so that his head was no longer visible, although he occasionally popped his head up to look around. Detective Ruzzo then radioed Atlantic City Police Detectives William Warner and James Barrett, who were nearby, stating that he had in his sight a male “waiting in the area to possibly buy C.D.S.”
Shortly afterwards, a red car pulled directly in front of the silver car, so that the two vehicles faced each other nose-to-nose. Defendant, the driver of the red car, exited and approached the silver vehicle. Detective Ruzzo observed defendant lean into the open passenger’s window of the silver car and hand “an object” to Atkinson in exchange for what the detective believed was “one bill of currency.” Just as Detective Ruzzo radioed for Detectives Warner and Barrett “to move in,” the two detectives arrived on the scene. 1
Detective Warner saw defendant lean into the silver car and then walk away. He did not see an exchange between Atkinson and defendant. As defendant walked in the direction of Detectives Warner and Barrett, who had exited their vehicle, he placed “something” in his back pocket. The detectives then took defendant into custody.
Detective Warner next approached the driver’s side window of the silver car and
In the meantime, Detective Ruzzo walked toward the red car and observed Monae Butcher in the front passenger seat “stuffing something down the rear of her pants.” He also took notice of an infant in the back seat. Detective Ruzzo ordered Butcher out of the car and called a female officer to assist after Butcher denied having any contraband on her. Before the female officer undertook a search, Butcher pulled from the back of her pants thirteen bags of heroin, also stamped with the logo “Sweet Dreams.”
The police later recovered a $100 bill from defendant’s rear pocket and an additional $56 from his person.
B.
At trial, the prosecutor presented Detective Kevin Lockett of the Atlantic County Prosecutor’s Office as an expert “in the field of narcotics use and distribution as well as the accompanying aspects of narcotics distribution.” The prosecutor posed the following hypothetical question:
I ask you to assume that all the facts I am giving you are true.
Assume that, assume that a vehicle, a silver vehicle, pulls up to the curb on a side street of [a public housing project] in Atlantic City. Assume that the occupant, the sole occupant, of that car, then bends his seat back, reclines it back so his head is invisible and waits there while at times picking his head up thusly.
Assume that a short time later, another car approaches and a red car parks head-to-head at a curb. Assume that there are two occupants of that red car, a female and a male. Assume that the male is driving and the female is a passenger.
Assume that the male driver leaves the red car and walks up to the silver car. Assume that the male leans into the passenger side of the silver car, hands the driver of the silver ear ten packets of heroin and receives from the man in the silver car $100.
Assume that the male walks away from the car about ten or 15 steps and is arrested by police. Assume that on his person is a hundred dollar bill and $56 in a separate pocket, separate location of currency. Assume that the $56 is in the denominations of two twenties, three fives and one $1 bill.
Assume that the female passenger is sitting facing forward, the arrest a very short distance, possibly from me to you. Assume that the female passenger of the red car who arrived with the male is sitting watching the arrest. Assume that the female passenger stuffs 13 bags, 13 bags, packets, of heroin into the rear of her pants, the rear of her pants.
Assume that there is a total — between the ten in the silver car and the 13 bags on the female passenger — there’s a total of 23 bags of heroin.
Assume that the items in S-19 are the same as, appear the same as, for purposes of this hypothetical, assume that the 23 bags recovered appear as the bags in S-19. And I want you to take them out and put them all out one-by-one in front of you.
Assume that the ten bags that the male handed to the driver of the silver car in exchange for $100 and the 13 bags in the — in the female’s pants appeared the same as those bags. Are you able to [form] an opinion as to whether the femalein possession of the 13 bags — I’m sorry. I missed — I missed two facts.
Assume additionally that there was nothing else in the — in the pocket that held the hundred dollar bill that the male took from the sale. And assume that no use paraphernalia of any kind is in the possession of either the male or the female; no hypodermic syringes, no straws, no CDs with lines cut up; no use paraphernalia.
Based on the facts that I have given you, are you able to form an opinion as to whether the 13 bags the female possessed, are you able to form an opinion as to whether the female possessed those 13 bags for personal use or distribution.
Detective Lockett responded: “Based on the facts that you’ve given me, that’s consistent with the distribution. Based on those facts, ... it appears consistent that the female may have conspired with the male or conspired with the male to distribute C.D.S. That would be my opinion on it.” Defendant did not object to the hypothetical question or to the response.
Defendant did not present any witnesses.
C.
The jury convicted defendant of third-degree possession of heroin, N.J.S.A 2C:35-10(a)(l); third-degree possession of heroin with the intent to distribute, N.J.S.A. 2C:35-5(a)(l) and N.J.S.A. 2C:35-5(b)(3); third-degree distribution of heroin, N.J.S.A. 2C:35-5(a)(1) and N.J.S.A 2C:35 — 5(b)(3); third-degree possession of heroin with intent to distribute within a school zone, N.J.S.A. 2C:35-7; and second-degree possession of heroin with intent to distribute within 500 feet of a public housing facility, N.J.SA 2C:35-7.1. Defendant was found not guilty of third-degree conspiracy to distribute heroin, N.J.SA 2C:5-2 and N.J.SA 2C:35-5(b)(3). 2
In light of defendant’s prior convictions, the trial court imposed an extended term sentence of ten years with a five-year period of parole ineligibility for possession of heroin with intent to distribute within a school zone and a concurrent term of ten years with a five-year period of parole ineligibility for possession of heroin with intent to distribute within 500 feet of a public housing facility. The court also imposed applicable fines and penalties. The remaining charges were merged.
Defendant appealed.
II.
The Appellate Division affirmed defendant’s convictions and sentences. The panel rejected defendant’s arguments that the testifying police officers improperly offered opinion testimony that a drug transaction had taken place and that the prosecutor improperly assumed as a fact in the hypothetical question that defendant distributed drugs to Atkinson.
We granted defendant’s petition for certification.
State v. Simms,
220
N.J.
40,
A.
Defendant argues that Detective Ruzzo’s radio calls that he “was possibly observing a C.D.S. transaction” and that “there was a C.D.S. transaction taking place” — admitted through Detective Warner’s testimony — constituted impermissible opinion on an ultimate issue of fact.
Next, defendant contends that the prosecutor’s hypothetical question to the drug expert improperly assumed a fact not in evidence. Defendant points out that although Detective Ruzzo observed defendant hand only “an object” to Atkinson, the hypothetical asked the expert to assume that defendant gave ten packets of heroin to Atkinson for $100. Defendant maintains that it was for the jury to determine whether such a sale occurred.
Defendant, moreover, posits that because defendant was tried jointly with Butcher, he was prejudiced by the expert’s opinion testimony that Butcher had conspired with defendant to distribute heroin. He maintains that disputed facts should have been reserved for the jury’s determination.
Finally, defendant submits that (1) the use of the hypothetical to elicit ultimate-issue testimony from a drug expert, in this and other drug prosecutions, does not assist the jury in understanding the evidence, but rather invades its exclusive province as factfinder and (2) that an expert’s opinion, which amounts to a declaration of guilt, causes prejudice that far outweighs the probative value of the testimony. 3
B.
The State counters that Detective Ruzzo’s characterization of his observations of defendant — as relayed through Detective Warner’s testimony' — did not constitute opinion testimony. According to the State, Detective Ruzzo’s call to Detective Warner that a “C.D.S. transaction was taking place” was simply a request that Warner enter the area for the purpose of detaining defendant and Atkinson, and therefore Detective Ruzzo’s description was “the essence of fact testimony.”
The State concedes “that its hypothetical question to its expert witness slightly exceeded the facts in evidence by referring to a sale of heroin.” The State, however, claims that the misstep did not draw an objection and did not constitute plain error.
The State also maintains that the hypothetical question, which elicited from the expert an opinion that the co-defendant was engaged in a drug-distribution scheme, could not have adversely affected defendant because the jury acquitted the co-defendant of the drug-distribution charges.
Last, the State asserts that an expert witness should be permitted “to testify directly on the criminal nature of a drug defendant’s conduct ... premised on [the expert’s] general knowledge of the illegal drug trade,” provided it is made clear that the expert’s opinion does not rest “on any special knowledge of the defendant’s state of mind.” The State “recommends that the use of hypothetical questions be permitted but not required to elicit the opinion testimony.”
C.
The Attorney General, as amicus curiae, acknowledges that expert testimony is not necessary to assist the jury in determining “whether a simple narcotics transaction
IV.
A.
Expert testimony is admissible “[i]f scientific, technical, or other specialized knowledge will
assist
the trier of fact to understand the evidence or to determine a fact in issue.”
N.J.R.E.
702 (emphasis added). Expert testimony that “embraces an ultimate issue to be decided by the trier of fact,”
N.J.R.E.
704, is not admissible unless the subject matter is beyond the ken of the average juror.
State v. Nesbitt,
185
N.J.
504, 515-16, 519,
From our evidence rules, we have established guiding principles to ensure the proper use of opinion testimony in drug cases. Expert testimony is not necessary to tell the jury the “obvious” or to resolve issues that the jury can figure out on its own.
Id.
at 514,
B.
In this ease, Detective Ruzzo observed defendant lean into a car window and hand the driver “an object” in exchange for what appeared to be “one bill of currency.” Shortly afterwards, ten packets of heroin with the logo “Sweet Dreams” were found on the passenger’s seat of that car. Almost simultaneously, the police arrested the co-defendant, who was sitting in defendant’s car in possession of thirteen packets of heroin stamped with the same logo.
Detective Warner testified that Detective Ruzzo radioed at one point that he “was possibly observing a C.D.S. transaction” and at another point that “there was a C.D.S. transaction taking place.” That testimony violated the precepts articulated in
State v. McLean,
205
N.J.
438,
In
McLean,
we reversed the defendant’s possession-with-intent-to-distribute convictions because a testifying police officer, who observed the defendant hand only an item to an individual in exchange for money during a surveillance, expressed the opinion that a drug transaction had occurred.
Id.
at 443, 463,
The facts here, like in
McLean,
were simple and straightforward, and the jury was fully capable of deciding whether defendant engaged in an act of drug distribution. No objection, however, was made to that testimony, which also constituted hearsay.
N.J.R.E.
801(c) (“ ‘Hearsay’ is a statement, other than one made by the
C.
The hypothetical question in this case required the drug expert to assume facts that were not established through testimony and that were hotly contested. Indeed, the assumed facts answered the very issue the jury was charged to resolve — whether defendant handed packets of heroin to the driver of the silver ear in exchange for money.
The prosecutor asked the jury to assume that the driver of the red car (defendant) walks up to a silver car and “leans into the passenger side of the silver car, hands the driver of the silver car ten packets of heroin and receives from the man in the silver car $100.” The trial testimony, however, did not support this portion of the hypothetical. As noted earlier, Detective Ruzzo saw only an object in defendant’s hand. The ultimate issue to be decided by the jury was whether the “object” was in fact the “ten packets of heroin.” The jury was expected to resolve the disputed issue by “sorting through all the evidence and using their common sense to make simple logical deductions.”
Cain, supra,
224
N.J.
at 426-27,
The issue here is similar to one presented in
Sowell, supra.
There, a corrections officer observed an individual take from her front pocket an “item” and place it in the hands of the defendant-inmate during a prison visit. 213
N.J.
at 94,
We found that the expert’s opinion did not meet the standard for admissibility of expert testimony.
Id.
at 104-07,
Even though defendant made no objection to the prosecutorial error highlighted here, that error was exacerbated by the expert’s ultimate-opinion testimony, to which we turn now.
D.
The expert witness in this case, Detective Lockett, expressed the opinion that the thirteen packets of heroin found in the
In that case, the defendant was convicted of possession of heroin and possession with intent to distribute.
Id.
at 289,
There is no meaningful difference between the flawed expert testimony in
Reeds
and the expert testimony challenged in this case. In both cases, by tracking the statutory language, the experts rendered an ultimate-issue opinion expressing a belief in the guilt of the defendants. As in
Reeds,
here, the use of a narcotics expert was not necessary to tell the jury the “obvious” in the case of “a straightforward” vehicle search.
See id.
at 293, 299,
Nevertheless, the cumulative effect of the errors in the present ease were “clearly capable of producing an unjust result,”
R.
2:10-2, requiring a reversal of defendant’s convictions.
See State v. Weaver,
219
N.J.
131, 155,
V.
The parties and amicus Attorney General filed briefs “addressing the rationale and need for hypothetical questions in the trial of a drug case, and the circumstances under which such questions may be used.” Our response to that issue in Cain obviates the need for a detailed discussion here. But certain principles enunciated in Cain bear repeating because they have direct application to the facts before us.
“To the extent possible, questions posed to an expert witness in a drug case should be compact and easy to understand____[Simplicity in sentence structure will be helpful to the witness and the jury.”
Cain, supra,
224
N.J.
at 430-31,
Straightforward facts that are not in dispute should not require a hypothetical, even when expert testimony may be of assistance to the jury.
Id.
at 429,
The hypothetical in this ease, like the hypothetical in
Cain, supra,
224
N.J.
at 436-38,
When the ultimate issue of fact in a drug ease is the defendant’s state of mind or an issue that the average juror can resolve without assistance, expert testimony is not permissible. The discussion here and in Cain should provide guidance in the appropriate use of hypotheticals and expert testimony in drug eases.
VI.
For the reasons expressed, we reverse the judgment of the Appellate Division and vacate defendant’s convictions. We remand to the trial court for proceedings consistent with this opinion.
Notes
Detective Warner testified that Detective Ruzzo radioed that he "was possibly observing a C.D.S. transaction” and that, after the red car pulled up, "there was a C.D.S. transaction taking place.” No objection was raised to this testimony.
The jury convicted Butcher only of third-degree possession of heroin. She was acquitted of conspiracy to distribute heroin and a number of possession-with-intent-to-distribute charges.
Defendant also argues that his sentence was excessive, but we need not reach that issue.
