It isn't just taken the same day. It's taken at the same time. It is separated into two samples as a means of testing how the handlers in and out of the lab did in order to detect any contamination.Considering the b sample is taken the same day, what were we expecting here?
How about they mentally test the dorks who like to test these guys? They have to watch the fighters penis. Who wants that job? not this guy........
The b sample testing positive shows it wasn't a false positive. Jon took something that contained banned substances.