OPINION OF THE COURT
Appellant Ronald Murphy (“Murphy”) appeals from the Superior Court’s order affirming the judgment of sentence imposed against him by the Court of Common Pleas of York *280 County as a result of his convictions for delivery of a controlled substance, 35 P.S. § 780—HS/alCSO), 1 and for conspiracy to deliver a controlled substance,18 Pa.C.S. § 903. 2 We affirm.
On August 30, 2000, Pennsylvania State Trooper Timothy Longenecker, a member of the York County Drug Task Force, drove to the intersection of Queen and Liberty Streets in the City of York to make a controlled undercover purchase of heroin. Trooper Longenecker parked his car across the street from an apartment building where Murphy was seated on the front steps. The trooper exited his car, approached Murphy, and asked him if he knew where to buy some “dope,” which the trooper testified was slang for heroin. See N.T., 3/9/2001, at 66. Murphy responded by asking Trooper Longenecker if he was a “cop.” See id. After the trooper answered no, Murphy called out to another man across the street, Jose Rivas (“Rivas”), and asked him to come over. See id. at 66, 89.
Rivas walked over to the trooper and Murphy and immediately asked Murphy whether the trooper was a cop, to which Murphy replied “no, he’s cool.” See id. at 66. Rivas then turned to Trooper Longenecker and asked him how much drugs he wanted. See id. Trooper Longenecker stated that he wanted two bags. See id. at 67. Rivas told the trooper to “wait here” and then walked north down Queen Street. See id. Trooper Longenecker and Murphy remained behind and engaged in casual conversation. See id.
Several minutes later Rivas returned to Murphy and Trooper Longenecker and told Trooper Longenecker to follow him. See id. at 67. The two walked east on Liberty Street about one-half of a block. See id. at 93. At that point, Rivas dropped two bags of heroin on the ground and told the trooper to likewise drop the payment on the ground. 3 Trooper Longe *281 necker picked up the drugs, dropped two previously marked twenty-dollar bills on the sidewalk, and walked away. See id. at 67. As he walked, he turned around and saw Rivas picking up the money he had left on the sidewalk. See id. at 68, 94.
When the trooper reached his car, Murphy approached him and asked for half of a bag of heroin. See id. at 68. Although the trooper refused to give Murphy any drugs, he handed Murphy $5.00 before getting in his car and leaving the scene. See id. Moments later, other members of the York County Drug Task Force arrested Rivas and Murphy. Rivas was arrested in a grocery store approximately half of a block from the intersection where the drug transaction took place. See N.T., 3/8/2001, at 53. When he was arrested, he had the two marked bills used by Trooper Longenecker to buy the drugs. See N.T., 3/9/2001, at 101. Murphy was arrested as he crossed a street in the vicinity of where the drug sale took place. See N.T., 3/8/2001, at 35. Murphy only had a couple of dollars on him when he was arrested. See id. at 48. He did not have any drugs. See id. at 49.
Due to his participation in the transaction, Murphy was charged with the offense of delivery of a controlled substance as well as the offense of conspiracy to deliver a controlled substance. A jury trial was held on the charges on March 8 and 9, 2001. After the Commonwealth presented its case, Murphy moved for a judgment of acquittal on the basis of the “buyer’s agent defense,” which he argued was accepted by this Court in
Commonwealth v. Flowers,
After all of the evidence was presented and prior to the jury’s deliberations, Murphy requested an instruction on the “buyer’s agent defense.” The trial court denied the request, finding that the standard conspiracy instruction, which explained that the evidence must show that the co-conspirator intended to commit the crime and that mere presence at the crime scene was insufficient to establish such intent, satisfied Murphy’s concerns with regard to the buyer’s agent defense. The trial court subsequently gave such a conspiracy instruction as well as a similar instruction on accomplice liability. 5 Following their deliberations, the jury convicted Murphy of both charges. As a result of his convictions, the trial court sentenced Murphy to twenty-three to forty-six months of incarceration on each conviction, with the two sentences to run consecutively.
Murphy appealed to the Superior Court, arguing that the evidence was insufficient to convict him of the delivery and conspiracy charges and that the trial court erred in refusing to instruct the jury on the “buyer’s agent defense.” As an initial matter, the Superior Court found that the evidence was insufficient to establish that Murphy was liable as a principal for
*283
delivering a controlled substance.
6
See Commonwealth v. Murphy,
The Superior Court also found that the evidence was sufficient to convict Murphy of conspiring to deliver the drugs with Rivas. See id. at 1037-39. According to the court, the jury could have inferred that Murphy and Rivas had an agreement by which Murphy screened prospective drug buyers for Rivas to sell drugs to on the basis of the evidence showing that when Rivas came over to Murphy and the trooper after being called, he promptly asked Murphy whether the trooper was a “cop” and then, without asking any further questions, asked Trooper Longenecker how much drugs he wanted. See id. The Superior Court then determined that the trial court properly refused to instruct the jury regarding the “buyer’s agent defense,” finding that the defense was inapplicable as the *284 evidence supported the delivery related charges against Murphy. See id. at 1040. Accordingly, the Superior Court affirmed Murphy’s judgment of sentence.
Murphy filed a petition for allowance of appeal to this Court arguing that the lower courts erred in finding that the evidence was sufficient to support his convictions because such a decision contradicts this Court’s decision in
Commonwealth v. Flowers,
In determining whether the evidence was sufficient to support a defendant’s conviction, we must review the evidence admitted during the trial along with any reasonable inferences that may be drawn from that evidence in the light most favorable to the Commonwealth as the verdict winner.
Commonwealth v. Rivera,
The offense of delivery of a controlled substance is provided for in section 780-113(a)(30) of The Controlled Substance, Drug, Device and Cosmetic Act, (the “Act”). 8 According to that section, the offense occurs in the following circumstances:
Except as authorized by this act, the manufacture, delivery, or possession with intent to manufacture or deliver, a controlled substance by a person not registered under this act, or a practitioner not registered or licensed by the appropriate State board, or knowingly creating, delivering or possessing with intent to deliver, a counterfeit controlled substance.
35 P.S. § 780-113(a)(30). The term delivery, as used in this section, is defined by the Act as “the actual, constructive, or
*285
attempted transfer from one person to another of a controlled substance, other drug, device or cosmetic whether or not there is an agency relationship.” 35 P.S. § 780-102. Thus, for a defendant to be liable as a principal for the delivery of a controlled substance there must be evidence that he knowingly made an actual, constructive, or attempted transfer of a controlled substance to another person without the legal authority to do so.
See Commonwealth v. Metzger,
A defendant actually transfers drugs whenever he physically conveys drugs to another person.
9
See Commonwealth v. Cameron,
It is well-established, however, that a defendant, who was not a principal actor in committing the crime, may nevertheless be liable for the crime if he was an accomplice of a principal actor.
See
18 Pa.C.S. § 306;
see also Commonwealth v. Bradley,
In the instant case, because there is no evidence that Murphy physically conveyed the drugs to Trooper Longenecker or directed Rivas to convey drugs that were under his control to the trooper, we agree with the Superior Court that the evidence was insufficient for the jury to convict Murphy as a principal for the delivery of the drugs. We also agree with the Superior Court, however, that the evidence was sufficient for the jury to find that Murphy was Rivas’ accomplice in the drug delivery. Thus, we reject Murphy’s argument that we must reverse the Superior Court’s decision based on
Commonwealth v. Flowers,
In
Flowers,
an undercover police officer approached the appellant, Donald Flowers, while he was standing in a public square and asked him if he had any drugs.
The Superior Court affirmed Flowers’ conviction, finding that the evidence was sufficient to convict him as an accessory to the sale because the sale would not have occurred but for Flowers’ introduction of the officer to Shiner. See id. On appeal, this Court reversed. We found that the Superior Court improperly applied a causation test in determining whether the evidence established that Flowers had aided and abetted in the crime. See id. at 1270-71. We explained that the Superior Court should have instead considered whether the evidence established that Flowers “was an active partner in the intent to make [the] sale.” 11 Id. at 1271. We then determined that the evidence did not indicate that Flowers *288 had any intent to actively participate in the drug sale. See id. In doing so, we explained:
The uncontroverted evidence is that appellant approached neither Shiner nor the agent. The agent first approached appellant and asked him for drugs, and appellant’s answer was simply that he had none. The prosecution does not contend that he offered to obtain any, or that he made any suggestions as to where or from whom it might be procured. There is no evidence that he met Shiner by design or plan, or that Shiner was any more than a passing acquaintance. The evidence establishes only that shortly after the agent’s request Shiner came over to appellant and his friend, and that appellant then suggested to the agent that Shiner had marijuana. The evidence implies more a friendly gesture of accommodation than an intent to bring about a sale, especially when viewed in light of the total absence of any allegations that appellant benefited in any way from the transaction. The evidence is that appellant did not handle either cash or marijuana, did not enter into negotiations or delivery, and was present only passively during the ride to Shiner’s residence and the transaction thereafter. None of the evidence proves beyond a reasonable doubt that appellant had any interest whatsoever in whether this sale ever took place.
Id.
Putting aside our finding that Flowers did not have any intent to aid in the drug sale, we then pointed out that “if Flowers [could] be said to have assisted anyone [during the transaction,] it was the buyer, not the seller.”
Id.
at 1272. We explained that as Flowers had been charged as an accessory to the delivery of the drugs under 35 P.S. § 780-113(a)(30), there had to be some evidence that he aided or collaborated with the drug deliverers for him to be liable as an accessory to that offense.
See id. (citing to Commonwealth v. Simione,
Contrary to Murphy’s claims, we find that the evidence in the instant case is not only more substantial than that presented in
Flowers,
but also clearly sufficient to convict Murphy as an accomplice to the delivery of the drugs. As previously noted and as made clear by this Court in
Flowers,
for a defendant to be deemed an accessory to a crime, there must be evidence that the defendant had an intent to promote or actively aid in the commission of the crime as well as evidence that the defendant actually aided the principal in committing the crime.
See
18 Pa.C.S. § 306. Accordingly, for a defendant to be an accessory to the offense of delivering drugs, the defendant must have had the intent to actively aid in the delivery and then aided the deliverer.
13
See e.g., Flowers,
*290
Here, we find, as did the Superior Court, that the jury could have found that Murphy intended to aid in the transfer of drugs by Rivas to Trooper Longenecker based on the evidence that Murphy called out to Rivas after the trooper approached him, confirmed to Rivas that the trooper was not a police officer, stayed with the trooper while Rivas got drugs, and requested compensation from the trooper for his efforts. These acts were clearly sufficient for the jury to infer that Murphy wanted to actively assist Rivas in delivering drugs to the trooper so that he could seek drugs from the trooper afterwards.
See Wagaman,
We also find that the evidence showed that Murphy aided Rivas, the principal drug deliverer, in transferring drugs to the trooper based on the evidence that he screened the trooper by asking him if he was a police officer before calling Rivas, and that he then confirmed for Rivas that the trooper was okay to sell drugs to. While this evidence taken alone may have been insufficient for the jury to find that Murphy was aiding Rivas, rather than the trooper, we find that this evidence, when considered with the evidence that Rivas knew upon being called by Murphy that the trooper was interested in buying drugs, and that Rivas also immediately asked Murphy if the trooper was a “cop,” was sufficient for the jury to find beyond a reasonable doubt that Murphy was acting on Rivas’ behalf when he questioned the trooper about his status and then conveyed the trooper’s answer to Rivas.
See Cox,
*292
Next, we must consider whether the evidence was sufficient for the jury to convict Murphy of conspiracy to deliver heroin with Rivas. To convict a defendant of conspiracy, the trier of fact must find that: (1) the defendant intended to commit or aid in the commission of the criminal act; (2) the defendant entered into an agreement with another (a “co-conspirator”) to engage in the crime; and (3) the defendant or one or more of the other co-conspirators committed an overt act in furtherance of the agreed upon crime.
Spotz,
As with accomplice liability, “[m]ere association with the perpetrators, mere presence at the scene, or mere knowledge of the crime is insufficient” to establish that a defendant was part of a conspiratorial agreement to commit the crime.
Lambert,
We find that the evidence in the instant case was sufficient for the jury to convict Murphy of conspiracy to deliver the
*293
drugs. As discussed above, the jury could have found that Murphy intended to aid Rivas in delivering the drugs based on his acts of questioning the trooper to determine if he was a police officer, calling out to Rivas and confirming for Rivas that the trooper was not a police officer, and requesting drugs from the trooper after the sale was complete. Moreover, we find, as did the Superior Court, that the jury could have found that Murphy and Rivas had an agreement whereby Murphy would screen drug buyers before introducing them to Rivas based on Murphy’s acts of questioning the trooper and calling out to Rivas, and the evidence that Rivas knew upon being called by Murphy that the trooper was interested in buying drugs.
See e.g., Commonwealth v. Clark,
The Order of the Superior Court is affirmed.
Notes
. Act of April 14, 1972, P.L. 233, No. 64, § 13.
. Act of December 6, 1972, P.S. 1482, No. 334, § 1.
. The substance in the bags was later positively identified as heroin based on chemical testing. N.T., 3/8/2001, at 36.
. As explained
infra,
in
Flowers,
this Court found that a defendant could not be liable as an accessory to the delivery of drugs if he
solely
acted on behalf of the drug buyer.
See Flowers,
. In its conspiracy instruction, the trial court stated as follows:
The Defendant is not guilty unless he and the other had an agreement; that is, a common understanding and shared the intention to commit delivery of heroin____[I]f you convict the Defendant of the conspiracy charge, it must be because he was a party to a conspiracy and not just a knowing spectator to a crime committed by his companions.
N.T., 3/9/03, at 183.
With regard to accomplice liability, the trial court instructed:
A Defendant is guilty of a crime if he is an accomplice of another person who commits that crime. A Defendant does not become an accomplice merely by being present at the scene or knowing about a crime. He is an accomplice if with the intent of promoting or facilitating the commission of the crime, he solicits, commands, encourages, or requests the other person to commit it or aids, agrees to aid, or attempts to aid the other person in planning on committing it.
Id. at 185-86.
. In making this decision, the Superior Court found that Murphy could only be liable as a principal for delivering the drugs if he actually or constructively transferred the drugs to Trooper Longenecker.
See Commonwealth v. Murphy,
. Notably, "the facts and circumstances established by the Commonwealth need not preclude every possibility of innocence.”
Commonwealth v. Lambert,
. See supra n. 1, 35 P.S. §§ 780-101—780-144.
. As an agency relationship with the seller is not required for a person to be liable for the delivery of drugs,
see
35 P.S. § 780-113(a)(30), a defendant may be liable as a principal for delivering drugs even if he physically conveyed drugs to a drug buyer solely on the buyer’s behalf.
See e.g., United States v. Pruitt,
. That statute provided that a person would be deemed an accessoty before the fact if he "plan[ned], cooperatefd], assisted], aid[ed], counseled] or abet[ted] in the perpetration of a felony.”
Flowers,
. In making this determination, we cited the following reasoning of the United States Court of Appeals of the Sixth Circuit:
If the criterion for holding that one is guilty of procuring the commission of an offense, is that the offense would not have been committed except for such a person's conduct or revelation of information, it would open a vast field of offenses that have never been comprehended within the common law by aiding, abetting, inducing or procuring. As Judge Hand remarked, in United States v. Peoni, [100 F.2d 401 (2nd Cir. 1938)], 'It will be observed that all these definitions have nothing whatsoever [sic] to do with the probability that the forbidden result would follow upon the accessory's conduct; and that they all demand that he in some sort associate himself with the venture, that he participate in it as in something that he wishes to bring about, that he seek by his action to make it succeed. All the words used, even the most colorless, "abet,” carry an implication of purposive attitude towards it.’ [sic]
Flowers,
. In
Simione,
the appellant arranged a drug sale at the buyer’s request and then exchanged the money and drugs between the buyer and seller.
See Simione,
. Although this Court stated in
Flowers
that Flowers could only be liable as an accessory under 35 P.S. § 780-113(a)(30) if the evidence showed that he "was an active partner in the intent to make [the] ‘sale,’ ”
Flowers,
. Murphy argues that because he assisted the trooper during the transaction, he can only be liable as an accessory to the offense of purchasing drugs provided for in 35 P.S. § 780—113(a)(l9) (criminalizing "[t]he intentional purchase ... of any controlled substance ... from any person not authorized to sell” the substance). While we agree with Murphy that he could only be liable for purchasing drugs if the evidence showed that he had only assisted the trooper, the evidence here showed that he aided both the trooper and Rivas. Therefore, *292 based on his aid to Rivas, Murphy could be liable for the delivery of drugs.
