Does an arrest warrant for a defendant on supervised release need to be supported by an oath?

The panel itself recognizes that "no case of which we are aware has addressed" the question of whether an arrest warrant for a defendant on supervised release needs to be supported by an oath. United States v. Vargas-Amaya, 389 F.3d 901, 903 (9th Cir.2004). I suspect that the issue has not been the subject of litigation because it is well established that the district court has wide discretion to order an individual on supervised release to appear in court so as to ensure compliance with conditions of supervision.