That doesn't give us much to go off of. What area in the U.S. did you come across it?? And when you say it "Apparently" passed the tests I'm assuming you weren't there when it was tested??
That's correct, the guy tested them whilst I wasn't around. He also trialed one and said took half hour to hit and was quiet strong, long lasting high, than took a zanny, slept 8 hours and woke up fine.
OP I'm sure you already know this but never take a dealers word on test results. They sell drugs to make money not friends and a little BS to make you comfortable with the purchase isn't hard to do. Always test your own drugs before consumption.