Just a comment about Lupin's malady

[huntergreen_3]

No: HPFGUIDX 108820

Lissa:
>>What if Peter put the Imperius curse on Lupin to get him to do 
something? A lot of people were being controlled by the Imperius 
curse, and Peter obviously has no problems with some of these 
Unforgivable Curses... what if there was something the Order had that 
Voldemort needed, or information that was needed?

The main problem, of course, is that people seem to be able to tell 
when they've had the curse placed on them. Wouldn't that have meant 
that Lupin knew that Peter was the spy? (Unless a.) he couldn't tell 
who'd done it, or b.) he thought Sirius did it?)<<

HunterGreen:
I like that thought. He could have used a potion in conjunction with 
the imperious curse that made Lupin lose his memory (perhaps slipped 
to him right after a werewolf transformation, when Lupin was already 
confused). During this time Lupin could have done something strange 
or suspicious (perhaps something in the order that Lupin -- and 
others -- had access to disappeared) that wasn't enough on its own to 
prove he was a spy, but enough to make James and Lily and Sirius 
suspect him enough to not use him as a secret-keeper.
I like this theory (aside from the ESE!Lupin one, of course) better 
than the others, because it would explain why James and Lily would 
suspect Lupin as well as Sirius.