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The Gao Family had more than one medicine warehouse, and fortunately, all the ingredients on the prescription came from the same one. The employees of the Gao Family's Medicine Warehouse had already checked it once and found no issues. If Doctor Zou couldn't find any problems either, then that would indicate the issue wasn't with the medicinal materials.
Doctor Zou was old, and after sitting in a carriage for a whole day and night, he only managed to hold on for half a day before he was exhausted. In the end, Xiao Ruo spent a whole day and night checking the remaining materials and didn't find any poison mixed into them.
While Gao Yanpeng breathed a sigh of relief, he also fell into distress. The Prefectural Magistrate had asked him to provide evidence to prove his innocence if the problem wasn't with the medicinal materials. Now that he was certain the incident wasn't related to his family's medicinal materials, where was he supposed to find such evidence?