Well, they can transform into anyone they touch(which is anyone in the joint shinobi army because they pretty much fought everyone) and mimic their chakra levels to make themselves invisible to the sensor nin's. So how do you detect them? Think i read some stuff about Tsunade using Katsuyu, i don't know if that'll work cuz that's basically a medical technique and is probably chakra based.
Soooo, my solution:
Soooo, my solution:
Scent. Kakashi's sniffer dogs, Akamaru and all the other mutts from the inuzuka clan should be made to smell everyone in the camp. These zetsu's are using transformation jutsu, and transformation does'nt hide scent, even if the chakra is the same. NOTE: The Aburame clan bugs might also be an option, but i'm quite certain they also sense chakra.
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