Is Bt safe to eat?

Bacillus thuringiensis is a bacteria that produces a natural insecticide.  A gene from Bacillus thuringiensis is implanted in corn to cause the corn to produce the insecticide and reduce the use of artificial insecticides.  Bacillus thuringiensis has been used by organic producers  since the 1950's to protect their crops.  It is a soil bacteria that is found in trace amounts in all root crop foods like potatoes and carrots.  Here is a good article that goes into more detail.  Bt Corn safety