Can they? Well, that's up to you as DM. By rules as written, no, a cleric's aura doesn't work that way. All a cleric's aura does is change the line under the Detect Evil (or other alignment-related detection spell) that you check under.
Personally? I wouldn't allow it. It undermines those who have powers that do that, or use magic items (like the Amulet of Mighty Fists) to give them that power.
