Guan Yu put the silver needle in the tea, and the silver needle turned yellow immediately. Guan Yu said, "As before, this tea has been given a lot of Mongolian sweat medicine, but even if Mongolian sweat medicine is added, it will not kill people. It will only cause discomfort to people's body and go into deep sleep."

Next, Guan Yu took another silver needle and tried the blood spot behind the ears of ten thousand adults. Strangely, the silver needle did not turn black.

Now, not only the lips become purple, but also the entire instep become purple, which is obviously the reason for the increase of poisoning signs....