In Alta Proditione Nullus Potest Esse Accessorius Sed Principalis Solummodo Law & Legal Definition
Latin maxim in alta proditione nullus potest esse accessorius sed principalis solummodo means in high treason no one can be an accessory but each one is a principal.
The following is an example of a case law explaining the maxim:
“In treason all are principals. There are no accessories.” [Ex parte Bollman, 8 U.S. 75, 115 (U.S. 1807)].

