OOtP: Kreacher's concoction?

[hedge2staxy]

No: HPFGUIDX 66475

I keep thinking about the scene where Harry is falling asleep while 
working on his Potions essay.  He focuses in on a passage about 
plants used in confusing and befuddlement draughts "where the wizard 
is desirous of producing hot-headedness and recklessness" (Ch18 
p.383, OOtP, US ed.).  In his half waking state he is thinking about 
Sirius' behavior since being confined to the Black family residence 
and then goes on to think of how people might think he was a bit 
nutters if they knew that he (Harry) could feel what Vold. does.

What if, similar to the theory that Neville's plant might have led 
some to behave with too much bravey, Sirius really was under the 
influence of some sort of potion that was given to him by Kreacher 
or, perhaps, put in a place where Sirius would accidentally ingest 
it ( maybe in a bottle of the liquor Sirius was drinking ).  

This raises the question of whether Kreacher can make or obtain such 
a potion.  Also, could Kreacher disobey his master so completely as 
to essentially poison him?  I don't think he could do that so 
directly.  I do believe, though, that Kreacher could purposefully 
place a potion so that Sirius unwittingly befuddles himself.

I'd like to think that there was something beyond Sirius' true 
nature acting in OOtP.  He never gave good advice to Harry, but in 
this installment, he was over the top with some of his comments to 
Harry.

Kreacher hates Sirius enough to do something like this (he 
ultimately is responsible for Sirius' death) and Kreacher does take 
license with his loyalty to Sirius at other times (Kreacher's 
interpretation of being told to "Get out" and his thievery of Black 
heirlooms that Sirius throws away).  Perhaps, if the house elves 
take on an important role in the fight against Voldemort, we will 
find out more about Kreacher's betrayal of Sirius.

--hedge2staxy