I just bought three tabs of LSD from the dead concert just now in New York City. Do you think I should take them because I feel a bit unsure?
If you do, take them while you're feeling good and stable, and are in an environment where you'll feel safe and comfortable. Remember that you are in control of your own self, not the drug, and there is nothing to be afraid of. You'll be fine with the right attitude and proper knowledge.
Not really especially if OP sourced it from a Grateful Dead related concert. But in general the same network you find in Berkley has gotten product to the east coast. Can you find bad stuff? Sure.