[792]*792¶1 Mack Clarance Colquitt appeals his conviction for possession of a controlled substance, cocaine, following his termination from a drug court program. The agreement Colquitt entered into to participate in drug court was neither a stipulation that the substance in the underlying charge was a controlled substance nor a stipulation to the sufficiency of the evidence. And, although he agreed that the police report that included a field test of the substance could be admitted, there were no laboratory test results. We hold that the police report and field test were not sufficient evidence of a controlled substance. We reverse and remand to vacate the conviction.
Bridgewater, J.
¶2 In September 2002, subsequent to an arrest on an unrelated charge, a corrections officer searched Colquitt’s clothing during the booking process at the Pierce County jail and found a small plastic bag with several white, rock-like items in his rear pants pocket. The arresting officer then examined the items; in his report, he stated that the substance “appeared to be ‘rock cocaine.’ ” Clerk’s Papers (CP) at 59. He then conducted a field test, which tested positive for the presence of cocaine. Having already been given his Miranda1 rights, Colquitt stated that he did not want to make a statement regarding the substance.
¶3 That same day, the State charged Colquitt with unlawful possession of a controlled substance. Colquitt then filed a petition to participate in a drug program, which the trial court granted.2 Colquitt signed an agreement in which the trial court promised to dismiss the unlawful [793]*793possession charge against him if he successfully completed the drug program. But if Colquitt failed to complete the program, he agreed to proceed with a bench trial based solely on the facts in the police report and the laboratory reports. The State never conducted any laboratory tests of the items found on Colquitt.
¶4 In his petition to participate in drug court, Colquitt waived (1) the right to a speedy trial under CrR 3.3, (2) the right to a public trial by an impartial jury, (3) the right at trial to hear and question the witnesses who testify against him, (4) the right to have witnesses testify for him, (5) the right to testify at trial, (6) the right to contest the stop and/or the search and/or the voluntariness of any statement he may have given in his case, and (7) the right to good behavior release on sanction/contempt time served while in drug court. While Colquitt stipulated to a bench trial based solely on the police report and the laboratory reports, he did not stipulate to the sufficiency of the facts contained in these reports to support a conviction. Nor did he ever admit to possessing cocaine. Furthermore, the waiver indicates that the defendant must waive the right to public trial by a jury “in the county where the crime is alleged to have been committed.” CP at 14 (emphasis added). The use of the term “alleged” in the drug court petition form indicates that the parties to the agreement did not consider Colquitt to have admitted guilt. CP at 14.
¶5 Because the statute addressing drug courts does not mandate forms or procedures, counties are free to develop their own forms. Looking to chapter 10.05 RCW for guidance, we note that Pierce County’s forms do not incorporate the safeguards of the deferred prosecution statute. But, the drug court statute essentially authorizes a deferred prosecution. Pierce County’s agreement does not require a confession and stipulation for entry into drug court, wherein the defendant would freely agree and admit each allegation and stipulation contained in the petition. Nor is there an additional stipulation that the confession and the police reports constitute proof beyond a reasonable doubt [794]*794that the defendant was guilty of the offense charged and that the defendant has no affirmative defense to the charge. These agreements' would have avoided any question of the identity of the controlled substance. These additional agreements are consistent with those agreements in the deferred prosecution statute in district court under chapter 10.05 RCW.
¶6 Colquitt failed to comply with the conditions required to remain enrolled in the drug program, and the trial court terminated his enrollment. Based solely on the evidence contained in the police report, the trial court found Colquitt guilty of unlawful possession of the controlled substance, cocaine.
ANALYSIS
¶7 Colquitt argues that the evidence was insufficient to support his conviction of unlawful possession of the controlled substance, cocaine. In support of this argument, Colquitt notes that the State did not conduct a laboratory test and, therefore, the court did not have any laboratory reports before it. The police report, the only evidence offered to establish the identity of the substance, contains a statement that the officer thought the substance appeared to be cocaine and that the substance tested positive in a field test for cocaine. We agree with Colquitt that speculation and an unverified field test, with nothing more, are insufficient to support a conviction.3
¶8 Colquitt’s conviction in drug court can be compared to previous cases involving deferred prosecution under chapter 10.05 RCW. State v. Melick, 131 Wn. App. 835, 844-45, 129 P.3d 816 (2006) (the court “may apply the principles of chapter 10.05 RCW to drug court prosecutions” (citing State v. Cassill-Skilton, 122 Wn. App. 652, [795]*795658, 94 P.3d 407 (2004) (although drug court statute contains no provisions for operating the program, the court can use chapter 10.05 RCW for guidance))). In deferred prosecution cases where the defendant stipulates to admission of police reports but does not stipulate to guilt, the trial court can use the police report to find the defendant guilty only “if the evidence therein supports conviction.” State v. Shattuck, 55 Wn. App. 131, 134, 776 P.2d 1001 (1989). The State, therefore, still retains the burden of proof. Shattuck, 55 Wn. App. at 135.
¶9 Colquitt never stipulated to the sufficiency of the evidence presented in the police report. By contrast, for a defendant to qualify for a deferred conviction in district court, he is required by statute not only to stipulate to the admissibility of police reports but also to the sufficiency of the facts contained therein to support a finding of guilt. RCW 10.05.020. Before RCW 10.05.020 required a stipulation to the sufficiency of the facts, the court was not foreclosed from examining the sufficiency of the evidence. Abad v. Cozza, 128 Wn.2d 575, 587-88, 911 P.2d 376 (1996); former RCW 10.05.020 (1985), modified by Laws of 1996, ch. 24, § 1 (inserting a requirement for a stipulation to the sufficiency of the facts in subsections (2) and (3)), modified by Laws of 2002, ch. 219, § 7. We can examine the sufficiency of the evidence in this case. Colquitt did not stipulate to the sufficiency of the evidence, and a drug court agreement, like a deferred prosecution, is not tantamount to a guilty plea. See Abad, 128 Wn.2d at 579 (citing State v. Higley, 78 Wn. App. 172, 187, 902 P.2d 659, review denied, 128 Wn.2d 1003 (1995)).
¶10 Nevertheless, the State argues that Colquitt waived the right to challenge the validity of the field tests when he stipulated to the admissibility of the police report and faults him for raising the issue of sufficiency for the first time on appeal. Two factors are evident. Colquitt did not stipulate to the sufficiency of the evidence, even though he waived his right to testify or call any witnesses on his behalf. And, although he could have challenged the suffi[796]*796ciency of the evidence, sufficiency may be raised for the first time on appeal. RAP 2.5(a)(3); City of Seattle v. Slack, 113 Wn.2d 850, 859, 784 P.2d 494 (1989) (“Due process requires the State to prove its case beyond a reasonable doubt; thus, sufficiency of the evidence is a question of constitutional magnitude and can be raised initially on appeal.” (citing State v. Baeza, 100 Wn.2d 487, 488, 670 P.2d 646 (1983))). Review by this court is appropriate.
¶11 Due process requires the State to prove beyond a reasonable doubt all the necessary facts of the crime charged. State v. Hundley, 126 Wn.2d 418, 421, 895 P.2d 403 (1995) (citing In re Winship, 397 U.S. 358, 90 S. Ct. 1068, 25 L. Ed. 2d 368 (1970); State v. Acosta, 101 Wn.2d 612, 615, 683 P.2d 1069 (1984)). Evidence is sufficient to support a conviction when, viewed in the light most favorable to the State, any rational trier of fact could find the essential elements of the crime beyond a reasonable doubt. State v. Bryant, 89 Wn. App. 857, 869, 950 P.2d 1004 (1998) (citing State v. Rempel, 114 Wn.2d 77, 82, 785 P.2d 1134 (1990)), review denied, 137 Wn.2d 1017 (1999). In a sufficiency of the evidence claim, the defendant admits the truth of the State’s evidence and all inferences that reasonably can be drawn from that evidence. State v. Salinas, 119 Wn.2d 192, 201, 829 P.2d 1068 (1992) (citing State v. Theroff, 25 Wn. App. 590, 593, 608 P.2d 1254, aff’d, 95 Wn.2d 385, 622 P.2d 1240 (1980)). Nevertheless, the existence of a fact cannot rest upon guess, speculation, or conjecture. State v. Hutton, 7 Wn. App. 726, 728, 502 P.2d 1037 (1972) (citing State v. Carter, 5 Wn. App. 802, 490 P.2d 1346 (1971), review denied, 80 Wn.2d 1004 (1972)).
f 12 Generally, a chemical analysis is not vital to uphold a conviction for possession of a controlled substance. See State v. Hernandez, 85 Wn. App. 672, 675, 935 P.2d 623 (1997) (circumstantial evidence and lay testimony may be sufficient to establish the identity of a drug in a criminal case (citing In re Pers. Restraint of Reismiller, 101 Wn.2d 291, 294, 678 P.2d 323 (1984); State v. Eddie A, 40 Wn. App. 717, 720, 700 P.2d 751 (1985))). In Hernandez, this [797]*797court found sufficient evidence in several delivery or possession with intent to deliver cases in which officers provided detailed testimony about such things as: (1) their expertise in identifying drugs and drug-sale behaviors, (2) standard drug prices, (3) their observations of behavior consistent with drug sales, (4) the drug-using behavior of the persons contacting defendants, (5) the known drug areas in which the defendants were observed, (6) discovery of materials on the defendants consistent with those they saw defendants deliver, and (7) discovery of money in amounts consistent with drug sales. Hernandez, 85 Wn. App. at 678-82. The State also presented laboratory tests demonstrating that the materials actually found on some of the defendants were, in fact, controlled substances. Hernandez, 85 Wn. App. at 679-81.
¶13 In United States v. Dominguez, 992 F.2d 678, 681 (7th Cir.), cert. denied, 510 U.S. 891 (1993), the court stated that “as long as the available circumstantial evidence establishes its identity [as a controlled substance] beyond a reasonable doubt [,] [c]ircumstantial evidence establishing identification may include . . . lay-experience based on familiarity through prior use, trading, or law enforcement.” (Citations omitted.) The Dominguez court, however, emphasized that when the record lacked indicia as to what factors a Drug Enforcement Administration agent considered in determining the identification of a substance, the prosecution failed to establish the identity of that substance. Dominguez, 992 F.2d at 681-82.
¶14 In State v. Roche, 114 Wn. App. 424, 59 P.3d 682 (2002), Division One of this court reversed a conviction for possession of a controlled substance, even with a police officer’s testimony and a positive field test for methamphetamine. Roche, 114 Wn. App. at 431, 440. Roche appealed his conviction after it was discovered that the State crime lab chemist who tested Roche’s substance tampered with evidence to hide his own heroin addiction. Roche, 114 Wn. App. at 428. The officer’s testimony and a positive field test were inadequate for the State to try or sentence the defendant; [798]*798therefore, the court reversed the conviction. Roche, 114 Wn. App. at 440.
¶15 On the other hand, independent evidence provided to the trial court can be sufficient to find that a substance is cocaine beyond a reasonable doubt, even without reliable laboratory reports. See, e.g., In re Pers. Restraint of Delmarter, 124 Wn. App. 154, 163-64, 101 P.3d 111 (2004). For example, in Delmarter, the court upheld Delmarter’s conviction for possession of cocaine even after it was discovered that the same crime lab chemist in the Roche case tested Delmarter’s evidence. Delmarter, 124 Wn. App. at 157. In Delmarter, however, not only did a field test support Delmarter’s conviction but Delmarter admitted that he had in fact possessed cocaine. Delmarter, 124 Wn. App. at 163-64. Explicitly distinguishing the facts in Roche, the Delmarter court weighed the additional evidence of the confession in affirming the conviction. Delmarter, 124 Wn. App. at 163 (“Roche did not admit that the substances found in his home were methamphetamines, despite a positive field test[.]”) Even without laboratory results, an independent field test and a confession are sufficient to support a conviction for possession of a controlled substance.
¶16 Colquitt’s fact pattern is more similar to Roche than Delmarter as Colquitt did not confess that the item in his possession was cocaine. In Roche, despite the other evidence which pointed to a controlled substance, Division One reversed. Roche, 114 Wn. App. at 440. A search at Roche’s home disclosed the following: a pouch containing a substance that looked like methamphetamine, along with a razor blade and a paper rolled into a device commonly used to ingest drugs; several baggies of powdery substance that appeared to be methamphetamine; a ledger of drug sales; a scale; and $3,000 in cash. Roche, 114 Wn. App. at 431. At trial, a deputy testified that the substance: (1) looked like methamphetamine, (2) was packaged in a manner common in the methamphetamine trade, and (3) tested positive for methamphetamine in a field test. Roche, 114 Wn. App. at [799]*799431-32. In addition, the chemist testified that the substances were methamphetamine. Roche, 114 Wn. App. at 432.
¶17 After learning of the chemist’s drug use and possible evidence tampering, Roche appealed his conviction. Roche, 114 Wn. App. at 433. The State argued that Roche was not entitled to a new trial because the new evidence of the chemist’s incompetence would not change the verdict at trial. Roche, 114 Wn. App. at 433. Division One disagreed. Roche, 114 Wn. App. at 440. The court held that even though the evidence indicated that the chemist only tampered with heroin samples, untrustworthy crime laboratory analysis evidence for methamphetamine, even in light of the officer’s testimony and positive field test, would have prevented the defendant from being tried at all. Roche, 114 Wn. App. at 439-40.
¶18 In response to the chemist’s misconduct, the Snohomish County Prosecutor’s Office issued an internal memo discussing the sufficiency of evidence required to uphold a conviction for possession of a controlled substance in all of its cases involving the abusing chemist. Roche, 114 Wn. App. at 439. The conclusion pertinent to our consideration was that there must be a good confession and a positive field test to meet the sufficiency test. Roche, 114 Wn. App. at 439.4 Adopting this reasoning, the court vacated Roche’s conviction. Roche, 114 Wn. App. at 447.
¶19 A challenge to the sufficiency of the evidence, by its terms, is fact sensitive. Hernandez, 85 Wn. App. at 678. The facts supporting Colquitt’s conviction are even less indicative of guilt than those in Roche. For example, in Roche, the prosecutor had a strong circumstantial case, including a positive laboratory analysis corroborating the field test, even if its authenticity was questioned. Roche, 114 Wn. App. at 437-38. Here, in contrast, the State did not send Colquitt’s sample to the crime laboratory for any verification. In Roche, the police found the unidentified [800]*800substance with a scale, drug sale ledgers, and $3,000 in cash. Roche, 114 Wn. App. at 431. Here, the police found only several white, rock-like items in Colquitt’s pants pocket. The government’s failure to prove the identity of the substance underlying a drug conviction creates a significant problem, as it casts doubt on an essential element of the crime.5 Dominguez, 992 F.2d at 682.
¶20 Despite this problem, the dissent posits that “the uncontroverted evidence was sufficient.” Dissent at 803.6 We disagree with the dissent for the following reasons:
¶21 First, we agree with the dissent that lay testimony and circumstantial evidence may be sufficient to establish the identity of a controlled substance. As a matter of fact, we specifically state that circumstantial evidence may be sufficient (citing Delmarter, 124 Wn. App. at 163-64 (even without a laboratory test, an independent field test and confession support a conviction for possession of a controlled substance); Hernandez, 85 Wn. App. at 675 (circumstantial evidence and lay testimony may be sufficient to establish the identity of a controlled substance); and Dominguez, 992 F.2d at 681 (circumstantial evidence establishing a controlled substance beyond a reasonable doubt may include lay experience based on familiarity through prior use, trading, or law enforcement)).
¶22 But the problem here is the paucity of information supporting the officer’s identification of the white, rock-like items. The evidence here only demonstrates that the officer’s visual identification of the items was based on his conjecture, at best. See Michael D. Blanchard & Gabriel J. [801]*801Chin, Identifying the Enemy in the War on Drugs: A Critique of the Developing Rule Permitting Visual Identification of Indescript White Powder in Narcotics Prosecution, 47 Am. U. L. Rev. 557, 597 (1998). The record is devoid of evidence of the officer’s experience and training that would allow him to properly identify the items as cocaine.
¶23 From this and other statements, the dissent concludes that Colquitt is mounting “an untimely challenge to his newly-claimed-on-appeal lack of a foundation for the officer’s field observation and test of the cocaine.” Dissent at 808. But Colquitt is not challenging the foundation of the officer’s opinion; instead, he is challenging the sufficiency of the circumstantial evidence.7
¶24 Circumstantial evidence must prove the identity of the substance beyond a reasonable doubt. Whether the State has met its burden of establishing the identity of the items depends on a nonexhaustive list of factors, including: (1) testimony by witnesses who have a significant amount of experience with the drug in question, so that their identification of the drug as the same as the drug in their past experience is highly credible; (2) corroborating testimony by officers or other experts as to the identification of the substance; (3) references made to the drug by the defendant and others, either by the drug’s name or a slang term commonly used to connote the drug; (4) prior involvement by the defendant in drug trafficking; (5) behavior characteristic of use or possession of the particular controlled substance; and (6) sensory identification of the substance if the substance is sufficiently unique. State v. Watson, 231 Neb. 507, 514-17, 437 N.W.2d 142 (1989).
¶25 Had the State introduced more than simply the officer’s statement that the substance “appeared to be [802]*802‘rock cocaine,’ ” we could evaluate whether the officer based his visual identification of the items on more than conjecture. CP at 59. As it is, we cannot draw a conclusion based on more than the officer’s bald statement, which by itself is insufficient. And when we reach a conclusion on the sufficiency of the evidence that is different from the trial court’s conclusion, it is within our power to reverse the trial court.
¶26 After terminating Colquitt from the drug court program, the trial court conducted his trial. The entirety of Colquitt’s trial was as follows: “We have incident report 02260046. The substance of the report and the narrative of page three of three, the attachments, are sufficient for a finding of guilty.” Report of Proceedings (June 21, 2004) at 15. The trial court postponed sentencing until counsel accurately calculated Colquitt’s standard range.
¶27 The dissent also asserts that Pierce County typically neither requests a laboratory test of the controlled substance nor presents a laboratory report in connection with its drug court program. If so, then Pierce County risks a failure to present sufficient evidence to establish the identity of a controlled substance at a defendant’s trial. A confession and a stipulation to the sufficiency of the evidence would avoid this problem.
¶28 Finally, if an officer’s opinion and field test, without more, is sufficient in this case to prove the identity of a controlled substance beyond a reasonable doubt, then an officer’s opinion and field test, without more, certainly will be sufficient in other trials. Such an evidentiary standard would eliminate the need for laboratory tests, laboratory reports, or forensic chemists.
¶29 Colquitt’s conviction, with no laboratory results or other significant, sufficient corroborating evidence, must be reversed and the matter remanded to vacate the judgment.
Van Deren, A.C.J., concurs.