Ohio Rev. Code § 3109.72
The parent, guardian, or custodian of a child may negate, reverse, or otherwise disapprove any action taken or decision made pursuant to a caretaker authorization affidavit unless negation, reversal, or disapproval would jeopardize the life, health, or safety of the child. A parent, guardian, or custodian may negate, reverse, or disapprove a caretaker's action or decision only by delivering written notice of negation, reversal, or disapproval to the caretaker and the person responding to the caretaker's action or decision in reliance on the affidavit. The act to negate, reverse, or disapprove the action or decision, regardless of whether it is effective, terminates the affidavit as of the date the caretaker returns the child to the parent, guardian, or custodian or upon the expiration of fourteen days from the delivery of written notice of the negation, reversal, or disapproval if the caretaker has not filed a complaint in the interim pursuant to section 3109.76 of the Revised Code.
R.C. § 3109.72