[Avodah] Why is it Suggested that Gluten Free non-KLP Certified is not to be used during Pesach?

[Zev Sero]

The answer seems obvious: If there is no KLP certification then there is 
a real chance of a small amount of chametz.   Just because the label 
says gluten free doesn't mean it's 100% true.

-- 
Zev Sero            Wishing you a happy and kosher Pesach, and a
zev at sero.name       healthy season appropriate to your hemisphere