How are foods derived from GM crops assessed for food safety?

According to brochure; Importance Facts you Need to Know About GM Food, from GMAC Singapore, they mentioned that Under international food safety practices, food producers perform tests on the quality, allergenicity, toxicity, composition and nutritional values of food derived from GMOs, before these foods are released. Foods containing new substances through genetic modification then needs to undergo additional testings.

http://www.gmac.gov.sg/Index_Resource_Professors_GENE_ius.html

This is comfirmed with another source from International Service for the Acquisition of Agri-biotech Applications (ISAAA):

Before they are allowed in the market, it has to be tested by the developer and independently evaluated for safety by scientists or experts in nutrition, toxicology, allergenicity, and other aspects of food science. Typical questions that must be address include:

• Does the GM food have a traditional counterpart that has a history of safe use?
• Has the concentration of any naturally occurring toxins or allergens in the food changed?
• Have the levels of key nutrients changed?
• Do new substances in the GM food have a history of safe use?
• Has the food’s digestibility been affected?
• Has the food been produced using accepted, established procedures?

1. GM food tested the same way as foods produced by other methods. The risks of foods from biotech are same as those for conventional foods.
2. They will be judged on their individual safety, allergenicity, toxicity, and nutrition rather than the methods or techniques used to produce them.
3. Any new ingredient added to food through biotech will be subject to pre-market approval in the same way as new food additive (preservative or food color) must be approved before it reaches the market.

Are Foods Derived from GM Crops Safe?, February 2006, ISAAA, Pocket K, No. 3

http://www.isaaa.org/Kc/inforesources/publications/pocketk/default.html