The issue of GMO is very complicated, and many of the folks who vehemently oppose it, also don't really understand it. Anything that moves people toward a better understanding of what is going on, is a good thing. Ignorance may be bliss, but willing ignorance is the mark of fanatics. In many cases the objections are centered on perceived and aesthetic differences, rather than quantifiable health issues. Beyond that, creating two segregated food streams can only add to the cost of food and make it more difficult for people to get good nutrition, which is the primary function of food in the first place. 

Detecting Genetically Modified Foods - Easier said than done
 
> How can you tell a genetically modified soybean from a conventionally produced soybean? This is the question many countries are grappling with as they look at the issue of labelling of foods produced through biotechnology. You can't tell just by looking or tasting the soybean. And unless it has been modified in some way that changes its nutritional characteristics, such as a lower fat content, you also can't tell by doing a routine nutritional analysis.

> The PCR method detects DNA sequences resulting from genetic modification. The analysis must be undertaken in a laboratory by trained staff using highly specialised equipment. This method is extremely sensitive and, in theory, it should be able to detect the presence of genetically modified ingredients even at very low levels.

> One of the main problems with PCR methods is that DNA is generally not detectable in highly heat-processed foods, hydrolysed plant proteins, purified lecithin, starch derivatives and refined oils that have come from genetically modified crops. The method cannot be used therefore for products such as refined oils and sugars in which the rDNA cannot be detected. 

> Another problem is that the sensitivity of PCR methods results in a significant number of false positive readings. The test also takes more time than immunoassays with results normally taking one day for the assay and 3 to 5 days to be processed. PCR and related analyses typically cost between US$100 and US$300 per sample.

> Neither the PCR nor the ELISA technique has been accepted as quantitatively reliable because of a lack of standardised sampling techniques and a lack of reliable control standards. The good news is that agencies in Europe and the US are working on reference standards and validation programmes for rDNA testing methods. This will enable labelling regulations to be introduced where required and provide the necessary support for resolving disputes arising from trade in genetically modified products. More work needs to be done to ensure that crop segregation methods are both manageable and affordable.

SOURCE:
http://www.afic.org/

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