A.R.S. § 12-890: Agreement to recover property

A. A written, signed agreement to pay for the recovery or for assistance in the recovery of property under this article is unenforceable if the fee or payment agreed on exceeds thirty per cent of the value of the recoverable property.

B. Nothing in this section shall be construed to prevent an owner from asserting, at any time, that a written, signed agreement to recover property is based on excessive or unjust consideration.