OPINION
¶ 1 We granted review to consider whether purely personal e-mails generated or maintained on a government e-mail system are, as a matter of law, public records under Arizona’s public records law, Arizona Revised Statutes (A.R.S.) sections 39-121 to 39-121.03 (2001 & Supp.2006). 1 We hold that such e-mails do not necessarily qualify as public records. We further hold that when a *3 government entity withholds documents generated or maintained on a government-owned computer system on the grounds that the documents are personal, the requesting party may ask the trial court to perform an in camera inspection to determine whether the documents fall within the public records law.
I.
¶ 2 In late 2005, the Pinal County Sheriffs Office began an investigation of then-County Manager Stanley Griffis after learning of Griffis’ unauthorized purchase of sniper rifles and other equipment with county funds. 2 Phoenix Newspapers, Inc. (PNI) filed a public records request with Pinal County (the County) pursuant to A.R.S. §§ 39-121 to - 121.03, seeking release of all e-mails sent to or received by Griffis on the County’s e-mail system from October 1 to December 2, 2005. The County released 706 e-mails, but withheld others it and Griffis considered personal or confidential. After PNI threatened to sue, the County agreed to release the previously withheld e-mails and notified Griffis of its decision.
¶ 3 Griffis obtained a preliminary injunction blocking release of e-mails that both he and the County initially had agreed were personal. PNI moved to intervene and dissolve the injunction, and the County joined this motion. The County then prepared a log identifying each e-mail subject to the injunction 3 and allowed Griffis to redact any personal information before providing the log to PNI. Griffis chose to disclose approximately thirty of the e-mails listed in the log.
¶ 4 The superior court granted PNI’s motion to dissolve the injunction, ruling that the remaining e-mails should be disclosed, but giving Griffis the opportunity to redact any personal information. The superior court noted that “everything that is on a computer of the Pinal County ... governmental entity is presumed to be a public record” and that “any records generated on a public computer are presumptively open to public inspection.” Although it found the e-mails to be presumptively public records, the superior court offered to conduct an in camera inspection of the disputed e-mails to determine whether Griffis could establish an expectation of privacy that would overcome that presumption, Griffis declined and appealed the decision.
¶ 5 The court of appeals, relying on
Salt River Pimar-Maricopa Indian Community v. Rogers,
¶ 6 PNI petitioned for review, arguing that the court of appeals misapplied Salt River and ignored Arizona’s longstanding presumption in favor of providing public access to government records. Alternatively, PNI urges us to remand for an in camera inspection of the disputed e-mails to determine whether they fall within the scope of the public records law. We have jurisdiction pursuant to Article 6, Section 5, Clause 3 of the Arizona Constitution and A.R.S. § 12-120.24 (2003).
II.
¶7 Whether a document is a public record under Arizona’s public records law presents a question of law, which we review de novo.
See Cox Ariz. Publ’ns, Inc. v. Collins,
A.
¶ 8 We have set forth the legal principles that control the issue raised here in previous public records cases.
See Salt Riv
*4
er,
¶ 9 In
Salt River,
this Court articulated three alternative definitions of public records: A public record is one “made by a public officer in pursuance of a duty, the immediate purpose of which is to disseminate information to the public, or to serve as a memorial of official transactions for public reference”; a record that is “required to be kept, or necessary to be kept in the discharge of a duty imposed by law or directed by law to serve as a memorial and evidence of something written, said or done”; or any “written record of transactions of a public officer in his office, which is a convenient and appropriate method of discharging his duties, and is kept by him as such, whether required by ... law or not.”
¶ 10 The broad definition of public records, however, is not unlimited. The public records law requires all public officials to make and maintain records “reasonably necessary to provide knowledge of all activities they undertake
in the furtherance of their duties.” Carlson,
¶ 11 Because the nature and purpose of the document determine its status, mere possession of a document by a public officer or agency does not by itself make that document a public record,
id.,
nor does expenditure of public funds in creating the document,
id.
at 540-41,
¶ 12 Although the public records law creates a strong presumption in favor of disclosure, that presumption applies only when a document first qualifies as a public record. To apply a presumption of disclosure when a question exists as to the nature of the document is inappropriate: The initial inquiry must be whether the document is subject to the statute.
Salt River,
¶ 13 Determining whether the public records law requires disclosure, then, involves a two-step process. When the facts of a particular case “raise a substantial question as to the threshold determination of whether the document is subject to the statute,” the court must first determine whether that document is a public record.
Id.
If a document falls within the scope of the public records statute, then the presumption favoring disclosure applies and, when necessary, the court can perform a balancing test to determine whether privacy, confidentiality, or the best interests of the state outweigh the policy in favor of disclosure.
7
E.g., Carlson,
B.
¶ 14 Applying the principles discussed above, we reject PNI’s argument that all e-mails generated or maintained on a government-owned computer system are automatically public records. Some e-mails will relate solely to personal matters and will not, therefore, reflect the requisite substantial nexus with government activities.
Accord Denver Publ’g Co. v. Bd. of County Comm’rs,
III.
¶ 15 Comparing the nature and purpose of a document with an official’s or agency’s activities to determine whether the required nexus exists necessarily requires a fact-specific inquiry. To make that inquiry, while maintaining the privacy of personal, non-public documents, a court should perform an in camera review.
See Church of Scientology v. City of Phoenix Police Dep’t,
¶ 16 To further Arizona’s strong policy of public access and disclosure of public rec
*6
ords, the threshold showing needed to raise a “substantial question” about a document’s status must be relatively low. When, as in this case, the question is whether e-mails from or to a public official are public records, we hold that a party can raise a substantial question by showing that a government agency or public official withheld documents generated or maintained on a government-owned computer on the grounds that those documents are personal or private. Once a requesting party makes this basic showing, that party can ask the court to conduct an in camera inspection of any withheld documents to determine whether they possess the requisite nexus with official duties that is required of all public records.
8
The party claiming that the disputed documents are not public records bears the burden of establishing its claim. If the party cannot establish that the documents are not public records, the trial judge can still consider whether privacy, confidentiality, or the best interests of the state outweigh the policy in favor of disclosure.
See, e.g., Carlson,
¶ 17 In this ease, no court has reviewed the e-mails at issue. Absent such a review, we have no record on which we can determine the nature and content of the requested documents. We therefore remand this case to permit the superior court to review the content of the disputed e-mails in camera to determine whether they are subject to the public records law. Griffis bears the burden of establishing that the e-mails are not public records.
IV.
¶ 18 For the foregoing reasons, we reverse the ruling of the superior court, vacate the opinion of the court of appeals, and remand to the superior court for further proceedings consistent with this opinion.
Notes
. This case raises neither the issue of whether Pinal County, as the owner of the computer system, can access an employee's e-mails nor the issue of access to a government employee's emails when excessive e-mail use is the reason for termination.
Cf. Tiberino v. Spokane County,
. Griffis was suspended from his position in December 2005 and retired shortly thereafter. In January 2007, he entered into a plea agreement with the State with respect to the criminal charges filed against him.
. The log contained the date and time sent, sender, recipient, subject line, and number of pages for each e-mail.
. PNI attempts to minimize
Salt River's
importance in resolving the issue before us on the grounds that it involves a unique intersection of state, federal, and tribal law. We disagree. Although the document at issue in
Salt River
was a check distribution list of amounts paid to tribal allottees,
. Because the language of A.R.S. § 39-121.01.B is so broad, this Court has abandoned any "technical distinction” between public records and other matters.
Carlson,
. Although not at issue here, "other matters” likewise includes only
public
matters.
Salt River,
. Most public records cases concern only the interest-balancing step because the documents at issue are clearly public records.
See, e.g., Scottsdale Unified Sch. Dist. No. 48 v. KPNX Broad. Co.,
. Our courts have long approved of in camera review during the second step of public records analysis to determine whether privacy interests, confidentiality, or the best interests of the state outweigh the public’s right of access to documents that have already been categorized as public records.
See, e.g., Cox Ariz. Publ'ns,
