GIS
The Genetic Incongruity Scan, or GIS, is the blood test developed by Ultracorps in order to identify Different individuals. The test was first designed in 2002 and became mandatory for all Metro Area citizens after the passage of the Different Acts of 2005. In 2007, the test was redesigned into its current two-part system with first the carrier test, and then the more intense GIS scan.
The GIS scan operates by decoding the genetic sequence of the suspected Different individual. The sequence is then scanned for patterns that are known to be associated with Differents. The test is time-consuming and expensive. That is why the carrier test was developed in 2007.
The carrier test checks for proteins that are only found in individuals who carry genes associated with Differentiation. Individuals being tested place a sample of saliva on a 3-inch strip of paper that has been treated with a series of chemicals. This strip turns blue if the proteins are present. Only 10% of carriers of the Different genes actually show signs of Differentiation. The other 90% possess the gene, but they are filled with DNA that does not code for Differentiation. They do not have any effect on the individual. These proteins can usually be detected by the age of 10, but some individuals display them from birth. Therefore, children are given the GIS Carrier test at birth and then again annually between the ages of 10 and 17. Any individuals immigrating to the Metro Areas must also be tested.
The GIS system is estimated to identify 97% of Different individuals tested. The weakness of the tests is largely human. Occasionally the tester assigned to inspect the pair of chromosomes will misidentify the genetic information found as unrelated to Differentiation, when in fact the individual is a Different. There have also been instances of testers being bribed in order to hide results.
