Originally Posted by
asphodeli
Ah, good thinking, I always thought the alignment of spells were always the caster's alignment and not because of the action. However I think this argument is flawed since people will be forced to do things against their will, whether good or bad, e.g. soldiers in an army, a parent disciplining his/her child, etc. I think what matters is what the action ultimately does. For example, if I dance someone because he is about to fall off a cliff, is that a good action, or an evil one?
But back to your idea...this perspective could prove useful in PnP one day...
It's not my idea, its right out of the 3.x rules. From the SRD: http://www.d20srd.org/srd/spells/protectionFromEvil.htm
Second, the barrier blocks any attempt to possess the warded creature (by a magic jar attack, for example) or to exercise mental control over the creature (including enchantment (charm) effects and enchantment (compulsion) effects that grant the caster ongoing control over the subject, such as dominate person). The protection does not prevent such effects from targeting the protected creature, but it suppresses the effect for the duration of the protection from evil effect. If the protection from evil effect ends before the effect granting mental control does, the would-be controller would then be able to mentally command the controlled creature. Likewise, the barrier keeps out a possessing life force but does not expel one if it is in place before the spell is cast. This second effect works regardless of alignment.
Any attempt to charm or mentally control you is blocked by prot from evil. Nice and clear.