Pax said:
It was true during playest, but it was not true in the published 3.0 rules. Nor has it become true in the published 3.5 rules.
Pax - not multiple attacks delivered separately (iterative attacks, two weapon fighting, rapid shot, etc), but multiple damage sources delivered in a single attack.
Manyshot. 3E Shuriken. The Orb spells from Tome and Blood. All of those could only deliver Sneak Attack damage on the first damage source. (Strictly, by the rules, if you threw three shuriken, only the first
star, not the first
hit, could be a sneak attack... so if your first missed and second and third hit, there was no Sneak Attack damage.)
If Scorching Ray follows the pattern of the Orb spells, only the first ray is eligible for sneak attack, since all three rays are in fact a single "attack" - even tough they use separate rolls and can be aimed at separate targets. Contrast this with Chill Touch, which requires a separate "attack" for each touch - if you want to deliver more than one in a round, you need to use a Full Attack Action after the spell has been cast.
-Hyp.