Examples:
The "Vampires" (Hopping Vampire, Thought Stealer) drop low req in NM (Skins of Stoneroot Chest). But for that you have to kill them before they kill themselves with Suicide Health (note of wiki: Creatures dying due to the effects of this skill will not drop items or give experience.). I've dropped quite a few of them, but nothing extraordinary yet.
Can req 0 items drop from those guys?