Is it permissible to eat French fries grilled in the same oil that was used for grilling non-halal chicken?

Fatwa, posted 4.22.2010, from Iraq, in:
Religious Authority: 
Ali al-Sistanti
Website URL: 
http://www.sistani.org/
Fatwa Question or Essay Title: 
Is it permissible to eat French fries grilled in the same oil that was used for grilling non-halal chicken?
Websites and Institutions: 
The Official Website of Grand Ayatollah Al Uzma Seyyid Ali al-Sistani

No, it is not permissible.

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