A lot of if's there. To start, piercing the corporate veil is not simply a matter of using the LLC's funds. Alter ego is far more than that. Generally you would not pierce unless it was very undercapitalized or if a person acted as though it was his own. The second is very hard where there are other members. I don't ever recall it happening, but havent done a case search. In my gut, it seems like out protection could be pierced only to the one acting as the alter ego but in protection could be pierced against the entire LLC (although maybe only with a charging order--depending on the state). I both cases, other members outside protection should be fine as long as they behaved reasonably when they discovered any problems.
