Indiana Code Title 4. State Offices and Administration § 4-22-2-34

Sec. 34. (a) The governor may approve or disapprove a rule submitted under section 33 of this chapter with or without cause.

(b) The governor has fifteen (15) days from the date that an agency submits a rule under section 33 of this chapter to approve or disapprove the rule.  However, the governor may take thirty (30) days to approve or disapprove the rule if the governor files a statement with the publisher within the first fifteen (15) days after an agency submits the rule that states that the governor intends to take an additional fifteen (15) days to approve or disapprove the rule.  If the governor neither approves nor disapproves the rule within the allowed period, the rule is deemed approved, and the agency may submit the rule to the publisher without the approval of the governor.