I searched around the internet years back after someone I knew got a xanax bar that didn't affect him. If I remember correctly there were fake generic xanax bars going around in parts of the country, usa. I also remember reading about fake oxycodone 80mg pills going around. So it is indeed possible that you got a fake product, but I would say it is unlikely. The risk a dealer takes selling bunk shit is too much, a customer might kill their ass over this, so why risk it, ya dig? Dangerous game selling fake product, never know who will snap about it. Also don't rule out manufacture error, very unlikely, but nevertheless in the realm of possibility. Or your tolerance could be so high that 30mg wouldn't have a noticeable affect on you. I've been there in my life, years back where I would barely notice the change in feeling after taking two 30's. So it's a mystery that might not be solved... ever. That's okay, get a new dealer or get off the shit. Idk.