He noticed that Nurse Li's cuffs were covered with some powdery stuff, a very subtle piece. If he hadn't had good eyesight and careful observation, he wouldn't have noticed it.

When Nurse Li reached out to take the kraft paper bag, Cao Yu saw it clearly.

And taking advantage of the opportunity to hand over the kraft paper bag, he touched Nurse Li's cuff with his cuff, and successfully rubbed the tiny powder on his cuff.

Then, Cao Yu just smelled the cuffs.

His nose was very sensitive. Although he only rubbed very fine powder, Cao Yu was still 70% or 80% sure that the powder was:

Sulfonamide powder!

It doesn’t seem too strange for a surgical nurse to get sulfonamide powder.

However, Cao Yu had long been secretly grasping the work areas and scheduling of these surgical ward nurses through secret observation and clichés from many nurses.

Nurse Li has been working in the eastern half of this ward these two days. As far as he knows, there was only one operation the day before yesterday in the eastern half of the ward. The hospital specially approved the use of sulfonamide powder. Neither yesterday nor today was injured.

Nurse Li’s nurse uniform is very new. You can smell the fragrance of soapberry. This is the clean nurse uniform I just changed this morning.

In other words, the sulfonamide powder rubbed on Nurse Li’s cuff must be the one I recently rubbed today.

In the eyes of people like Cao Yu, this discovery is almost equivalent to many doubts being opened, and many secrets will be solved-

Combined with his previous hidden discoveries and speculations, at this moment, he almost instantly remembered the "little Taoist priest" who was rescued and was searched by No. 76, the military police, and the police station, but never saw any trace...

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Chapter completed!