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When Klorel was tried in the planet of the Tollan people, he was removed from Skaara and will be sent to a Goa'uld world. Jaffas aren't influenced by Goa'uld but uses them (term comes from Teal'c when he insulted Apophis on his deathbed).
Will a Jaffa stay in control or if a higher power Goa'uld enters they take over?
While a Jaffa carries an infant symbiote, they are immune to becoming a host.
Once a Goa'uld is mature, he cant be inside a Jaffa any more. But in the case of an emergency, the Goa'uld can take over the Jaffa. It's mentoned in Crossroads Season 4, episode 4.
Also in SG-1 1969 episode. Teal'c says the mature symbiote will take over.
http://www.stargate-sg1-solutions.com/wiki/2.21_%221969%22_Transcript
TEAL'C - If I remain on this planet, I will eventually be taken over by my mature symbiote.
I think the question is not if the symbiote goes into the pouch, but what if a symbiot tries to take the Jaffa as a host.
In the episode Crossroads 4.04 What was preventing Tanith from burrowing through the pouch into Shan'auc brain and take her as a host.
It is never explained why Jaffa can not be hosts.
edit
In Stargate SG-1: Moebius Squared, Amaunet takes Shan'auc as a host, meaning that at least in the novels it is possible for a Jaffa to be taken as a host.
