Of the two cups on the tea table, one of the cups contained residual harmful substances, and the mouth of the cup was also extracted with saliva that matched the DNA of the deceased, which proved to be used by the deceased.

The other cup was used by another person, and no saliva was found on the edge of the cup, so DNA could not be extracted, but two sets of complete fingerprints were extracted from the body of the cup.

Two sets of fingerprints were extracted from the cup. One set of fingerprints belonged to the deceased, and the other set did not belong to the deceased, nor did it belong to the landlord who occasionally visited her house.