Whenever the pleadings filed on behalf of the state, or on behalf of any of its officers charged with the duty of collecting any tax, excise, license, interest, penalty or attorney's fees, shall be accompanied by an affidavit of the officer or of one of his deputies or assistants, or of the counsel or attorney filing the same, that the facts as alleged are true to the best of the affiant's knowledge or belief, all of the facts alleged in the pleadings shall be accepted as prima facie true and as constituting a prima facie case, and the burden of proof to establish anything to the contrary shall rest wholly on the defendant or opposing party.
La. R.S. § 13:5034