Could you point out where it says that?
From the srd
At 2nd level and higher, a rogue can avoid even magical and unusual attacks with great agility. If she makes a successful Reflex saving throw against an attack that normally deals half damage on a successful save, she instead takes no damage. Evasion can be used only if the rogue is wearing light armor or no armor. A helpless rogue does not gain the benefit of evasion
If you are going to quote rules,
STOP USING THE SRD!
It does not contain all the information on the rules. I will find the area in the 3.5 PHB that states the conditions for evasion not working.