OPINION
¶ 1 Gary Douglas Peek seeks review of a term of lifetime probation imposed upon his conviction for an act of attempted child molestation that occurred between 1994 and 1996. We conclude that lifetime probation was not available when Peek committed the crime and therefore vacate the trial court’s order placing him on lifetime probation.
I. FACTUAL AND PROCEDURAL BACKGROUND
¶ 2 In 2003, pursuant to a plea agreement, Petitioner Peek pled guilty to two counts of attempted child molestation that occurred between 1994 and 1996. In accordance with the plea agreement, the court sentenced Peek to ten years’ incarceration for the first count and imposed lifetime probation on the second count.
¶3 In 2006, Peek sought relief from the imposition of lifetime probation on count two by filing a petition for post-conviction relief, which the trial court summarily denied. After the court of appeals denied review, Peek petitioned this Court for relief, arguing that lifetime probation was not authorized by statute when he committed his crimes. We *183 granted review to address whether lifetime probation was available for conviction of attempted child molestation committed between 1994 and 1996. We have jurisdiction pursuant to Article 6, Section 5(3) of the Arizona Constitution, Arizona Revised Statutes (“A.R.S.”) section 13-4239 (2001), and Arizona Rule of Criminal Procedure 32.9.
II. DISCUSSION
¶ 4 Peek’s petition for post-conviction relief was untimely; his claim should have been raised in his “of right” petition for post-conviction relief. See Ariz. R.Crim. P. 32.1, 32.4. The State nonetheless joins Peek in asking that we address the legal issue raised. Because the State has waived preclusion and this case presents a recurring legal issue of statewide importance on which trial courts have rendered conflicting opinions, we will address the merits of the petition. See id. 31.19(c)(3); cf. id. 32.2(c) (placing the burden on the State to plead and рrove preclusion and affording the court discretion to raise preclusion sua sponte).
¶ 5 Peek argues that the court may not impose a sentence greater than that allowed by law at the time the offense was cоmmitted and that, when he committed his crime, the maximum allowable term of probation was five years. He therefore maintains that lifetime probation could not be ordered.
See Collins v. Youngblood,
¶ 6 The sentencing provision in effect when Peek committed his crimes provided in relevant part as follows:
After conviction of a felony offense that is included in chapter 14 of this title, if probatiоn is available, probation may continue for a term ... up to and including life and that the court believes is appropriate for the ends of justice.
A.R.S. § 13-902(E) (Supp.1993). We review statutory interpretation issues de novo.
State v. Armstrong,
A. Legislative Modifications to Lifetime Probation Statute
¶ 7 At all times relevant tо this case, Arizona statutes have defined various crimes against victims who are younger than fifteen as “Dangerous Crimes Against Children” (“DCAC”). A.R.S. §§ 13-604.01(K)(1) (1989), 13-604.01(J)(1) (Supp.1993), 13-604.01(E)(1) (Supp.1997). A completed offense was designated as a DCAC in the first degree and a preparatоry offense was a DCAC in the second degree. Id. §§ 13-604.01(E)(1) (1989), 13-604.01(J)(1) (Supp. 1993), 13-604.01(E)(1) (Supp.1997).
¶ 8 Before 1994, a person convicted of any second degree DCAC could be placed on lifetime probation. Id. § 13-604.01(1) (1989). Effective January 1,1994, however, the legislature amеnded various sections of the criminal code, including those relating to lifetime probation. 1993 Ariz. Sess. Laws, ch. 255, § 8 (1st Reg.Sess.). The legislature eliminated subsection 13-604.01(1), the provision allowing lifetime probation for second degree DCAC offenses, аnd placed in the general probation statute § 13-902(E), quoted above, which authorized lifetime probation for felony offenses “included in chapter 14.” 1993 Ariz. Sess. Laws, ch. 255, §§ 8, 17 (adding § 13-902(D), which was renumbered as 13-902(E)).
¶ 9 Thus, before January 1, 1994, lifetime probation wаs available for attempted (or second degree) DCAC offenses, but not for sexual offenses against adults. A.R.S. § 13-604.01(1), (E) (1989). After the change, lifetime probation was not restricted to crimes against children, but also was not available for all DCAC offenses. Id. § 13-902(E) (Supp.1993). For example, before the amendment, lifetime probation was available for attempted second degree murder of victims younger than fifteen, but unavailable for sexual abuse of victims fifteen years old or older. Id. §§ 13-604.01(1), (E), -902 (1989). Following the amendment, the opposite was true because the pivotal factor shifted from whether the victim was younger than fifteen to whether the offense was “included in chapter 14.”
*184 ¶ 10 In 1997, the legislature amended § 13-902(E) to exрlicitly apply to an attempt to commit an offense included in chapter 14. 1997 Ariz. Sess. Laws, ch. 179, § 2 (1st Reg. Sess.). Thus, lifetime probation was clearly available for an attempted child molestation occurring before 1994 or after the effectivе date of the 1997 amendment. This opinion addresses whether lifetime probation was also available in the intervening period during which Peek committed the attempt offense at issue.
B. Construing “a felony offense that is included in chaptеr 14”
¶ 11 When Peek committed his crimes, § 13-902(E) allowed lifetime probation for conviction of “a felony offense that is included in chapter 14 of [Title 13].” A.R.S. § 13-902(E) (Supp.1993). We must construe penal statutes “according to the fair import of their terms” to “еffect their object.”
Id.
§ 1-211(C) (2002). Our goal is to discern the legislature’s intent, the “best and most reliable index” of which is the statute’s language.
State v. Getz,
¶ 12 Section 13-902(E) seems clear: When Peek committed his crimes, it authorized lifetime probation only for offenses “included in chapter 14.” Although chapter 14 included the completed offense of child molestation, A.R.S. § 13-1410 (Supp.1993), it did not include attempted child molestation. Rather, attempted offenses were included in chapter 10 of Title 13. Id. § 13-1001 (1989). The legislature could rationally have chosen to treat preparatory offenses less harshly than completed crimes, and § 13-902(E) appears to reflect precisely such a choice. See Henry M. Hart, Jr. & Albert M. Sacks, The Legal Process 1124-25 (William N. Eskridge, Jr. & Philip P. Frickey eds., 1994) (suggesting that plain language be interpreted in light of context and reasonable purpose of statute).
¶ 13 The State argues that attempts are part of the completed offense or cannot be committed in isolation from the substantive offense. That argument, however, does not address whether the language of the statute in question encompassed attempted offenses within § 13-902(E).
¶ 14 Moreover, we have previously held that sentencing options for a substantive offense do not automatically apply to related preparatory offenses. In
State v. Herrera,
¶ 15 Similarly, in
State v. Tellez,
the court of appeals held that a fine mandated for “a violation of any provision of [§ 13-3408(A) ]” could not be imposed for solicitation to commit the substаntive offense because solicitation was an offense defined in chapter 10 of Title 13.
¶ 16 We find unpersuasive the court of appeals cases on which the State relies.
State v. Lammie,
¶ 17 In
Lammie,
the court relied on
Cory
and similarly affirmed the sex offender registration requirement.
Lammie,
¶ 18 Nor does
State v. Cornish,
¶ 19 The State next argues that the 1994 amendment did nothing to change the treatment of attempted crimes. We disagree. The legislature deleted clear language subjecting attempt offenses to lifetime probation and made lifetime рrobation applicable only for those offenses falling within chapter 14. Had the legislature intended to cover attempts, it would have chosen to use different language, as it did for the 1997 amendment to § 13-902(E), which explicitly appliеd to attempts to commit an offense included in chapter 14. 1997 Ariz. Sess. Laws, ch. 179, § 2. When the legislature intends to include attempts, it knows how to do so.
III. CONCLUSION
¶ 20 The statutes in effect when Peek committed his crimes did not authorize lifetime probation for attempted child molestation. The lifetime probation term imposed on count two was therefore illegal and accordingly is vacated. The order of the court of appeals declining jurisdiction and the superi- or court’s order dismissing the petition for post-conviction relief are vacated, and this matter is remanded to the superior court for resentencing in a manner consistent with this opinion.
Notes
. Section 13-3821 has since been amended and now clearly applies to attempted offenses. 1995 Ariz. Sess. Laws, ch. 257, § 3 (1st Reg.Sess.). No similar legislative history supports such a result for § 13-902(E).
