UPON A REHEARING EN BANC
McCLANAHAN, Judge.
A jury convicted Glen Patrick Merritt of possession of ecstasy (MDMA), a Schedule I controlled substance, with intent to distribute, second or subsequent offense, in violation of Code § 18.2-248; transporting ecstasy into the Commonwealth, with intent to distribute, in violation of Code § 18.2-248.01; and conspiracy to possess ecstasy with intent to distribute in violation of Code § 18.2-256. The Commonwealth’s theory was that Merritt served as the “muscle” in an illegal narcotics scheme in which his role was to safeguard the transportation of a large quantity of ecstasy into the Commonwealth. Merritt contends the evidence failed to prove the [546]*546Commonwealth’s theory and was, therefore, insufficient to support his convictions. A panel majority of this Court agreed and reversed the convictions.1 We granted a petition for rehearing en banc and stayed the mandate of the panel decision. Upon rehearing en banc, we affirm the trial court.
I. STANDARD OF REVIEW
“On review of a challenge to its sufficiency, we view the evidence in the light most favorable to the Commonwealth, the party prevailing below, and grant to it all reasonable inferences fairly deducible therefrom.” Nolen v. Commonwealth, 53 Va.App. 593, 595, 673 S.E.2d 920, 921 (2009); see also Barnes v. Commonwealth, 279 Va. 22, 35, 688 S.E.2d 210, 217 (2010). “Sufficiency-of-the-evidence review involves assessment by the courts of whether the evidence adduced at trial could support any rational determination of guilt beyond a reasonable doubt.” United States v. Powell, 469 U.S. 57, 67, 105 S.Ct. 471, 478, 83 L.Ed.2d 461 (1984). See also McMillan v. Commonwealth, 277 Va. 11, 19, 671 S.E.2d 396, 399 (2009); Jones v. Commonwealth, 277 Va. 171, 182, 670 S.E.2d 727, 734 (2009); Clanton v. Commonwealth, 53 Va.App. 561, 566, 673 S.E.2d 904, 906-07 (2009) (en banc).
II. BACKGROUND
On August 6, Virginia Beach police conducted an undercover drug interdiction at a bus depot operated by Today’s Bus, a bus line that conducts nonstop bus trips between the cities of Virginia Beach and New York.2 Detective Dean Massetti [547]*547arrived at the depot, dressed in civilian clothes, with his K-9, Sheena, at approximately 12:30 a.m. as the bus from Chinatown in New York was pulling into the depot parking lot. Detective Christopher Biswurm arrived shortly thereafter and followed Massetti and Sheena through the parking lot as they approached the bus. Sergeants Kenneth Dimitry and Richard Brereton were stationed nearby and observed a silver Lexus enter the parking lot. Because the driver and passenger of the Lexus “literally snapped their heads around to look at what was going on” when Massetti and Sheena passed by them, Dimitry and Brereton continued to watch them and observed the Lexus move out of the lighted area of the parking lot into a darker area that provided easy access to the road. The driver and passenger were later identified as Perry Bolton and Glen Merritt respectively. Merritt exited the vehicle holding a cell phone to his ear and followed Massetti and Sheena toward the bus. Merritt stood at the rear of the bus as Massetti sent Sheena into the luggage compartment of the bus to detect the odor of any illegal narcotics.3 Although Merritt was holding a cell phone to his ear, he was not talking into the cell phone or changing facial expressions but focused his attention on the luggage compartment area. In fact, according to Detective Biswurm, it would have been too noisy at the rear of the bus to hear anyone on a cell phone. He compared Merritt’s behavior to that of police officers conducting surveillance who “act like we’re talking into our phone, basically to draw attention away from us.”
After a short period of time, Merritt began looking into the crowd of passengers departing from the bus. Merritt then turned his attention to a male, later identified as Anthony McDaniels, as McDaniels looked in the luggage compartment. [548]*548McDaniels retrieved a suitcase from the luggage compartment and, accompanied by Erica Spratley, walked in front of Merritt. There was no greeting between Merritt and McDaniels or Spratley, but Merritt began “shadowing” McDaniels and Spratley and “behaving as if he was being a lookout” as they walked across the parking lot.4 Sergeant Dimitry testified that Merritt was, again, behaving the same way police do when they run surveillance on undercover drug operations.5 When McDaniels and Spratley reached the vehicle, Merritt continued walking past the vehicle and stood fifteen to thirty feet away “scanning the parking lot” and “watching what was taking place at the vehicle.” Bolton exited the vehicle, retrieved the suitcase from McDaniels, and placed it into the trunk of the Lexus.
Sergeant Dimitry instructed Massetti and Biswurm to approach the occupants of the Lexus because he believed they were acting “out of the ordinary for someone just picking somebody up from the bus stop.” As they approached, Massetti observed a plastic baggie corner on the ground underneath the front passenger’s door. According to Massetti and Biswurm, a plastic baggie corner is a common delivery system for street-level narcotics. This plastic baggie corner appeared to be “discarded remains.” Massetti took Sheena back to his van, retrieved a flashlight, and returned to the Lexus. When he returned, McDaniels was seated in the driver’s seat.6 Merritt was seated in the front passenger’s seat. Bolton was seated in the rear seat behind McDaniels, and Spratley was seated in the rear seat behind Merritt. Massetti identified himself to McDaniels and asked him about the baggie corner. [549]*549McDaniels claimed to have no knowledge of it. As Massetti was talking with McDaniels, Merritt began leaning forward and toward the console as well as manipulating his left front pocket, which appeared to have “something very bulky” in it. Concerned for his safety, Massetti asked if there were any weapons or drugs in the car. Bolton said he had a gun in the center console and ammunition in the glove compartment. Massetti and Biswurm, now joined by Dimitry and Brereton, then instructed all the occupants to exit the vehicle so they could be frisked for weapons. Although no guns were found on the occupants, Merritt was carrying a small knife attached to his belt. Two cell phones were found in Merritt’s left front pocket. When Massetti retrieved the gun from the console, he observed a small Zip-loc baggie sticking out of a small compartment to the left of the steering wheel and containing blue powder residue and a clear capsule. The residue field-tested positive for ecstasy (MDMA). Massetti recovered a .45 caliber semi-automatic handgun in the center console. In the glove compartment, he found the rounds belonging to the handgun “inside the magazine, so the magazine was ready to go.”7
After the discovery of the baggie containing ecstasy, Massetti and Biswurm conducted a search of the vehicle. In the trunk, they found a black suitcase containing several items of clothing, a shoebox containing a wallet and a pair of shoes, and a heat-sealed bag containing 998 tablets of ecstasy (MDMA). In the rear passenger’s seat of the vehicle, where Bolton had been sitting, was a Western Union receipt for $125 that was wired from Bolton to Merritt in New York City on August 2. Massetti testified that Western Union is commonly used in the drug industry to transfer money as payment for drugs or services. Also found in the same area was a receipt from the Smoke Shack dated August 5 for the purchase of 842 plastic baggies. According to Massetti, plastic baggies are commonly used for distribution of narcotics, such as ecstasy. Additional[550]*550ly, four tickets, purchased on July 27, for one-way trips between New York and Norfolk8 were found. The detectives also recovered a blue spiral notebook containing “drug notes” consisting of quantities of narcotics, monetary value, and initials or other information identifying an individual associated with the narcotics. On the last page of the notebook the letters “GMNY” were recorded with the figure of “1,000” next to the letters.
After arresting the four occupants, $1,336 in cash was recovered from Bolton and $1,410 in cash was recovered from McDaniels. The cash was subsequently screened with Sheena, and she alerted to the scent of illegal narcotics on the money. When Massetti and Biswurm examined the call records in the cell phones collected from Merritt, Bolton, and McDaniels, they discovered that Bolton’s cell phone contained the name “G Money” for the cell phone number of one of the phones found on Merritt. Massetti and Biswurm also determined there had been a large number of phone calls received and dialed between these cell phones in the several preceding days.
Upon questioning, Merritt told Massetti he did not know the other occupants of the Lexus well. Merritt said he was walking to his girlfriend’s house when Bolton stopped and offered him a ride. Bolton told Merritt he had to go to the bus depot first and instructed Merritt to get out of the car and walk to the bus when they arrived there. Merritt claimed he did not know why Bolton wanted him to get out of the car or stand at the bus. When Massetti told Merritt the police saw him carry the suitcase across the parking lot,9 Merritt “quickly” replied, “Tony was the one who wheeled the bag across the parking lot.” When Massetti asked who “Tony” was, Merritt [551]*551told him he was referring to McDaniels. After Massetti remarked he thought Merritt did not know him well, Merritt said he knew McDaniels from middle school.
Massetti, who was trained at the local, state, and federal levels on narcotics distribution, and has worked hundreds of cases involving narcotics distribution as the lead detective, was qualified at trial as an expert in illegal narcotics distribution. Massetti described the roles of individuals in drug distribution schemes and explained the primary dealer “has the money” and “does the distribution portion.” There is generally a “secondary person that is the muscle of the outfit.” Massetti described the secondary person as “usually somebody that is either bigger physically in stature” or armed who protects the money or drugs. The “mules” are the individuals who are paid either by money or a portion of the drugs to retrieve the illegal narcotics and take the risk of bringing the drugs into the Commonwealth. In Massetti’s opinion, Merritt was “an active part [of this drug scheme] as a muscle in the organization.” Massetti explained the Western Union receipt proved Merritt was in New York and received money from Bolton just days before the drugs were transported into the Commonwealth. There were numerous phone calls between Bolton, Merritt, and McDaniels in the days preceding the transaction. Merritt was observed shadowing McDaniels and Spratley after they departed from the bus and wheeled the suitcase containing drugs across the parking lot. Massetti testified that the use of two cell phones is commonly used in the drug industry with one phone for personal use and the other phone for business use. Massetti further stated Merritt’s close proximity to the gun and magazine was consistent with his role as the “muscle.” Massetti considered the designation of “GMNY” in the drug notebook significant because “G Money” was the identifier found in Bolton’s cell phone for the cell phone number of one of the cell phones found in Merritt’s pocket. Massetti testified the fact that Merritt did not have drugs or money on his person was also consistent with his role as the “muscle” since he is the “safety guy,” whose role it is to make sure the drug transaction takes place without someone stealing the drugs or money.
[552]*552Detective Thomas Fowler, qualified as an expert in the use, packaging, and distribution of narcotics, testified that possession of 998 ecstasy pills was inconsistent with personal use and was packaged for transportation and distribution. The value of each ecstasy tablet in Virginia Beach and Hampton Roads is $15 to $30, and the sale of 998 tablets of ecstasy would generate a profit of $10,000 to $30,000. Detective Fowler also discussed the roles of individuals involved in a drug organization and described the “muscle” of the organization as the “enforcer” or “lookout.” The functions of the “muscle” are to protect the illegal narcotics and “chase down” payments that are due. He is often willing to carry a firearm or other weapon and not afraid to use it. Detective Fowler stated the $125 sent from Bolton to Merritt in New York could have been payment for an additional night’s lodging or Merritt’s return home. In Detective Fowler’s opinion, the occupants of the Lexus were involved in a prearranged drug transaction based on the quantity of drugs, the presence of a firearm, the multiple cell phones, the large amount of cash emanating the scent of illegal narcotics, and the Western Union receipt showing the transfer of money from Bolton to Merritt days before the transportation of the drugs into the Commonwealth.
III. ANALYSIS
Merritt argues the evidence was insufficient to sustain his convictions because the Commonwealth’s theory he acted as a “muscle” or “lookout” in this illegal narcotics scheme was merely speculative and without sufficient evidentiary basis. Thus, reasons Merritt, the Commonwealth could not prove “Merritt possessed or had knowledge of the illegal drugs” or that he “participated as an accessory in any illegal drug activity.” We disagree.
A. Evidence to Support Merritt’s Role as “Muscle” or “Lookout ”
Merritt and Bolton arrived at a bus depot known as a major pipeline of narcotics into Virginia Beach in a vehicle [553]*553that was ultimately parked in a dark area of the lot facing the road providing easy access to the highway. Merritt was observed “shadowing” the movements of McDaniels and Spratley, holding a cell phone to his ear without speaking into it or showing any emotion, and continually “scanning” the parking lot. While Bolton placed the drugs into the trunk of the vehicle, Merritt posted himself behind the vehicle as he continued to scan the parking lot. Merritt’s actions were described as being consistent with the actions undertaken by police officers conducting surveillance of undercover detectives in that Merritt attempted to be covert, work with his environment, and act disinterested without drawing attention to himself. In fact, Merritt’s actions to protect the safety of the drug transaction were compared to the actions of a surveillance officer in protecting the safety of an undercover officer.
At no time did Merritt acknowledge McDaniels or Spratley while following them in the parking lot thus supporting the reasonable inference that he was not there to meet them and lead them to the vehicle.10 The only logical inference from this evidence is that Merritt was acting as a lookout while McDaniels and Spratley transported the drugs through the parking lot. Although Merritt claimed not to know Bolton, McDaniels or Spratley well, he told Detective Massetti that “Tony” was the one who “wheeled the bag across the parking lot” indicating a sufficient familiarity with McDaniels to use a nickname. Furthermore, calls to McDaniels were found in Merritt’s cell phone. In fact, police discovered a large number of phone calls made between the cell phones found on Merritt, Bolton, and McDaniels in the several days immediately preceding the arrest.
In addition to Merritt’s actions at the bus station supporting his role as the “lookout” for this transaction and the phone calls linking him to the other individuals involved in the drug [554]*554transaction, police recovered evidence at the scene showing Merritt’s direct involvement in the transportation, possession, and distribution of illegal drugs. A plastic baggie corner containing drug residue was found on the ground next to the front passenger’s door of the vehicle where Merritt was sitting, and its location and condition were consistent with having recently fallen out of the front passenger’s side of the vehicle. Within the vehicle, police recovered a drug notebook containing notes regarding the subject drug transaction specifically identifying the transaction as “GMNY 1000,” which the jury could reasonably infer referred to Glen Merritt, New York, or G Money, New York, and the quantity of ecstasy pills, of which 998 were recovered by police. With this notebook were four bus tickets for transportation between Norfolk and New York and receipts dated August 5 for a large number of baggies. In addition, the police recovered a Western Union receipt showing a payment of $125 from Bolton to Merritt that he received in New York on August 2. According to expert testimony, Western Union is commonly used in the drug industry for payments for services and the $125 was likely sent to Merritt for an additional night’s stay in New York and/or his transportation back to Virginia. Two cell phones were recovered from Merritt further supporting his involvement in the transaction since the use of two cell phones is common in the narcotics trade. And one of Merritt’s cell phone numbers was identified as “G Money” in Bolton’s cell phone. The police found a handgun in the console next to where Merritt was sitting and the magazine “ready to go” in the glove compartment directly in front of where Merritt was sitting. Therefore, the jury could reasonably infer Merritt had access to a firearm and, as the Commonwealth argued, could have been carrying the gun in the parking lot before he returned to the vehicle. Furthermore, the jury was undoubtedly in the best position to observe Merritt and judge whether his stature was consistent with the role of a “muscle” or “lookout” in this transaction.
Moreover, the jury was presented with expert testimony from Detective Massetti, who gave an opinion, unchal[555]*555lenged on appeal, that based on his training, experience, and observations, Merritt was the “muscle” or “lookout” in this drug transaction. “ ‘The jury has a right to weigh the testimony of all the witnesses, experts and otherwise.’ ” Hill v. Commonwealth, 8 Va.App. 60, 64, 379 S.E.2d 134, 137 (1989) (en banc) (quoting Martin v. Penn, 204 Va. 822, 826, 134 S.E.2d 305, 307 (1964)). The conclusions of the fact finder on issues of witness credibility “may only be disturbed on appeal if this Court finds that [the witness’] ... testimony was ‘inherently incredible, or so contrary to human experience as to render it unworthy of belief.’ ” Robertson v. Commonwealth, 12 Va.App. 854, 858, 406 S.E.2d 417, 419 (1991) (quoting Fisher v. Commonwealth, 228 Va. 296, 299-300, 321 S.E.2d 202, 204 (1984)). “These same principles apply to the testimony of both expert and lay witnesses.” Moyer v. Commonwealth, 33 Va.App. 8, 28, 531 S.E.2d 580, 590 (2000) (en banc). It is clear the jury accepted the testimony of Detective Massetti, and we cannot say his testimony was inherently incredible or unworthy of belief.
In sum, from this evidence, the jury could reasonably infer Merritt was in New York days before the arrest to arrange the purchase of 1,000 ecstasy pills when he received money from Bolton and served as the “muscle” or “lookout” as the drugs were transported for the purpose of further distribution. We may not “ ‘substitute our judgment for that of the trier of fact,’ ” Wactor v. Commonwealth, 38 Va.App. 375, 380, 564 S.E.2d 160, 162 (2002) (quoting Commonwealth v. Presley, 256 Va. 465, 466, 507 S.E.2d 72, 72 (1998)), nor may we “reweigh the evidence,” Nusbaum v. Berlin, 273 Va. 385, 408, 641 S.E.2d 494, 507 (2007), because we have no authority “to preside de novo over a second trial,” Haskins v. Commonwealth, 44 Va.App. 1, 11, 602 S.E.2d 402, 407 (2004).
B. Sufficiency of Evidence to Support Convictions
Since it was reasonable for the jury to infer from this evidence that Merritt served as the “muscle” or “lookout” in this drug transaction, the jury could rationally find Merritt guilty of aiding and abetting in the possession of ecstasy with [556]*556intent to distribute, aiding and abetting in the transportation into the Commonwealth of ecstasy with intent to distribute, and conspiracy to distribute ecstasy.
1. Possession With Intent To Distribute11
“To convict a defendant of illegal possession of drugs, the Commonwealth must prove that the defendant was aware of the presence and character of the drugs, and that he intentionally and consciously possessed them.” Andrews v. Commonwealth, 216 Va. 179, 182, 217 S.E.2d 812, 814 (1975).
“[P]roof of actual possession is not required; proof of constructive possession will suffice. Constructive possession may be established when there are acts, statements, or conduct of the accused or other facts or circumstances which tend to show that the [accused] was aware of both the presence and character of the substance and that it was subject to his dominion and control.”
Wilson v. Commonwealth, 272 Va. 19, 27, 630 S.E.2d 326, 330 (2006) (quoting Walton v. Commonwealth, 255 Va. 422, 426, 497 S.E.2d 869, 872 (1998)) (internal quotation marks and citation omitted). “Possession ... need not be exclusive, but may instead be joint.” Archer v. Commonwealth, 225 Va. 416, 418, 303 S.E.2d 863, 863 (1983).
The jury was instructed that it could find Merritt guilty as a principal in the second degree. To hold Merritt accountable as a principal in the second degree, the Commonwealth was required to show that Merritt was present, aiding and abetting in the possession of the ecstasy. McGill v. Commonwealth, 24 Va.App. 728, 733, 485 S.E.2d 173, 175 (1997).
A principal in the second degree is one not the perpetrator, but present, aiding and abetting the act done, or keeping watch or guard at some convenient distance. * * * Every [557]*557person who is present at the commission of a [crime], encouraging or inciting the same by words, gestures, looks, or signs, or who in any way, or by any means, countenances or approves the same is, in law, assumed to be an aider and abettor, and is liable as principal.
Foster v. Commonwealth, 179 Va. 96, 99, 18 S.E.2d 314, 315-16 (1942) (internal quotation marks and citation omitted); see also Dunn v. Commonwealth, 52 Va.App. 611, 665 S.E.2d 868 (2008) (en banc); Pugliese v. Commonwealth, 16 Va.App. 82, 428 S.E.2d 16 (1993).
Having found Merritt to be the “muscle” or “lookout” in this drug transportation scheme, it was reasonable for the jury to conclude Merritt was aware of the presence and character of the ecstasy and that he aided and abetted his companions in their possession and intent to distribute the ecstasy. His role, as found by the jury, was to be present at the bus depot when McDaniels and Spratley brought the ecstasy off the bus, follow them as they carried the ecstasy to the vehicle, and keep a lookout as the ecstasy was placed in the trunk of the vehicle. As such, the evidence was sufficient to prove Merritt was “present lending countenance, or otherwise aiding” the possession of the drugs with intent to distribute. Muhammad v. Commonwealth, 269 Va. 451, 482, 619 S.E.2d 16, 32 (2005).
2. Transportation into Virginia
To prove Merritt was guilty of transporting ecstasy with the intent to distribute, the Commonwealth was required to prove he transported more than one ounce of ecstasy “into the Commonwealth by any means with intent to sell or distribute [it].” Code § 18.2-248.01. Merritt does not contend that the Commonwealth failed to prove more than one ounce of ecstasy was transported into the Commonwealth with the intent to distribute it, but that the Commonwealth failed to prove his role as “muscle” or “lookout” in this transaction and thus, his participation as an accessory. To hold Merritt accountable as a principal in the second degree, the Commonwealth was required to show that Merritt was present, aiding and abetting in the transportation of the ecstasy with the intent to distrib[558]*558ute it. McGill, 24 Va.App. at 733, 485 S.E.2d at 175. The drug notebook found by police contained an entry associating Merritt to this transaction by designating the transaction as “GMNY 1000.” Based on the Western Union receipt for cash wired from Bolton to Merritt in New York on August 2, the jury could infer Merritt was there to arrange the purchase of the ecstasy for transportation into Virginia. And Merritt acted to ensure the successful transportation of the ecstasy into Virginia by serving as a “lookout” when McDaniels retrieved the drugs from the bus and carried them to the vehicle. Accordingly, we conclude the evidence was sufficient to prove Merritt was “present lending countenance, or otherwise aiding” his companions in the transportation of the drugs into the Commonwealth with intent to distribute them. Muhammad, 269 Va. at 482, 619 S.E.2d at 32.
3. Conspiracy to Distribute
To prove a conspiracy, the Commonwealth was required to show “ ‘an agreement between two or more persons by some concerted action to commit [possession of ecstasy with intent to distribute].’ ” Wright v. Commonwealth, 224 Va. 502, 506, 297 S.E.2d 711, 713 (1982) (quoting Falden v. Commonwealth, 167 Va. 542, 544, 189 S.E. 326, 327 (1937)); Williams v. Commonwealth, 53 Va.App. 50, 59-60, 669 S.E.2d 354, 358 (2008). “Because most conspiracies are ‘clandestine in nature,’ 2 Wayne R. LaFave, Substantive Criminal Law § 12.2(a), at 266 (2d ed.2003), by ‘the very nature of the offense, it often may be established only by indirect and circumstantial evidence,’ Wright, 224 Va. at 505, 297 S.E.2d at 713.” James v. Commonwealth, 53 Va.App. 671, 678, 674 S.E.2d 571, 575 (2009) (internal quotation marks omitted).
The jury found Merritt was the “muscle” or “lookout” in this illegal drug transaction involving the transportation of 998 tablets of ecstasy into the Commonwealth. In so finding, the jury concluded Merritt arrived at the depot to meet the bus arriving from New York for the purpose of providing security as the drugs were removed from the bus and carried to the vehicle. The evidence included phone calls between Merritt, [559]*559Bolton, and McDaniels in the days preceding the transaction, a Western Union receipt showing Bolton wired Merritt money while Merritt was in New York City just days before the transaction, the written notation, “GMNY 1000,” in the drug notebook found with Bolton, a receipt for plastic baggies purchased days before the transaction, and four one-way tickets to and from New York purchased before the transaction. Based on this evidence, it was reasonable for the jury to conclude, as testified to by Detective Fowler, that this was a prearranged transaction and to infer that Merritt agreed with his companions to serve as the “muscle” or “lookout” in their plan to transport ecstasy into the Commonwealth and possess it with the intent to distribute it. When
it has been shown that the defendants “by their acts pursued the same object, one performing - one part and the others performing another part so as to complete it or with a view to its attainment, the [fact finder] will be justified in concluding that they were engaged in a conspiracy to effect that object.”
Charity v. Commonwealth, 49 Va.App. 581, 586, 643 S.E.2d 503, 505 (2007) (emphasis added and citation omitted). Accordingly, we find the jury was justified in concluding that Merritt was engaged in a conspiracy to possess ecstasy with the intent to distribute it.
IV. CONCLUSION
For the foregoing reasons, we affirm the judgment of the trial court.
Affirmed.