How can we tell if a food is GM?

Identifying GM FOODS
Personally I didn’t realise that some of the GM genetically modified foods are cross bred with animal genes to enhance their properties for marketing purposes until I read the following article, although recently a brother i know touched on the subject when we were speaking.
Not many consumers realize that the FDA does not require genetically modified food to be labeled. That’s because the FDA has decided that you, dear consumer, don’t care if the tomato you’re eating has been cross bred with frog genes to render the tomato more resistant to cold weather. Some consumers may not be concerned with eating Frankenfood, but for those who are, here’s how to determine if the fruits and vegetables you’re buying are (GM) genetically modified.
Hat tip to Marion Owen for her valuable information. Here’s how it works:
For conventionally grown fruit, (grown with chemicals inputs), the PLU code on the sticker consists of four numbers. Organically grown fruit has a five-numeral PLU prefaced by the number 9. Genetically engineered (GM) fruit has a five-numeral PLU prefaced by the number 8.
For example:
A conventionally grown banana would be: 4011
An organic banana would be: 94011
A genetically engineered (GE or GMO) banana would be: 84011
These tips are specially important now that over 80% of all processed foods in the US are genetically modified. Many countries in the European Union have been banning GM products and produce (including Austria, France, Germany, Greece, Hungary and Luxembourg). We say “Eat healthy, buy or grow organic”.
As far as Islam is concerned with GM foods, the following is taken from this wonderful piece of writing mashallah.
: Islam and Biotechnology: With Special Reference to Genetically Modified
Foods
Author: Mohd Safian, Yasmin Hanani
Institutional Affiliation: Lecturer, Faculty of Shari`ah and Law, Islamic University
College of Malaysia
2.4 Changing God’s creation and tampering with nature:
Apart from environment effects, the GM food producers, farmers and manufacturers are
accused of changing natural process and tampering with nature when cattle were changed
from herbivores to cannibal carnivores. Previously, during winter when the grass is thin
and weak, soybean was used to feed the cattle, as they need protein supplement.
However, some farmers have used remnants of dead cattle instead of soybean as to save
cost. Consequently, the BSE (bovine spongiform encephalopathy) or mad cow disease
that attacked the UK nation widely was claimed as the detrimental effect of the step of
changing natural process.
Further more, as Saeed A. Khan argues that the positive consequences of GM technology
are also counterbalanced with an equally pernicious cost. The danger of overproduction
of crops may be irresistible. Although the crops that are resistance to disease and pests
have constructive value, the disruption to the balance of the ecosystem is unclear as
illustrated in the reports made by American Medical Association.
3.0 Al-Qur’an and Al-hadith views regarding GM foods and products:
3.1 Al-Qur’an and Al-hadith points of views regarding food intake:
As regard to the potential risks associated with GM food, Al-Qur’an has led several rules
on food intake. Allah The Almighty said:
“Eat of the things which God hath provided for you, lawful and good: But fear God, in
Whom ye believe” (Al-Qur’an. Al-Ma’idah 5: 88).
Our physical and spiritual well-being is being compromised for the sake of big business. These engineered crops are already being grown over millions of acres worldwide and can cross-pollinate with normal varieties.The environment is being mistaken for an experimental playground, a mistake that is creating unrecallable damage to the web of life
http://blog.friendseat.com/how-to-id-genetically-modified-food-at-the-supermarket