I've always found it extremely easy to hide the fact that i'm rolling. And it doesn't really kill my buzz either.
I realized this when I went to a friends house to play mario party, (yes a mario party party) and decided to pop a new pill that i had just gotten to test em out. Went to the party and after a while took a second one.
I have to say, ecstasy makes Mario Party one hell of a game. And I won!
But either way, I talked to my friends later on and told them that i had been on ecstasy and they said they had no idea. Its very simple to hide, I feel, and even after that time i've talked to my parents, even officers, while rolling and had no trouble.