Transgenic Plant
The controversy regarding the use of Bt corn is that it

is potentially harmful to monarch butterflies
can contaminate groundwater
is a potential allergen to humans
both (a) and (b)

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Transgenic Plant
In transgenic plants that have been manipulated to express patho-genesis-related (PR) proteins all the time it has been shown that

expression of two PR proteins provides some protection against a few pathogens
these proteins trigger the production of other antimicrobial defenses
these provide no protection at all against pathogens
expression of one PR protein provides high levels of protection against many pathogens

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