In any event if that occurred it would suggest they had made a mistake and monitored the person incorrectly. What is forgotten is that a person's life is not only made up of genes but emotions, things that they can't measure and are unreliable. For instance, genetics said Jerome Morrow "would have a long life span", what they could not account for was his first and only desire he ever had was to end his life". Uma Thurman's character Irene is part of the genetically superior beings but has a small heart problem, which is described as "unacceptable likelihood of heart failure". Even though she does have a minute flaw she is still able to attend Gattaca on the premise of only being allowed to do short missions. Irene is a part of the people who have and lead empty lives because of what a piece of paper says. She has this inferiority complex because even though she is part of the "valid" society she still contains the human essence, which is imperfection. In a scene where Vincent and Irene a running from Anton down an alley at a rapid speed, after accomplishing the run she turns to Vincent and says," can't you see I can't do that" then Vincent replies "you just did". Irene like others have been taught to look so hard for any flaws that after a while that's all they see. At one point she's even hesitant to approach Jerome (Vincent) because she finds out that he's almost perfect. She goes up to him and gives him a strand of her hair as a way of telling him before he befriends her that he might not want to because of her heart condition.
While Jude Laws" character Jerome Morrow was also part of the genetically superior beings he was even considered "next to godliness" The problem with Jerome Morrow was that even though genetics said he "would have a heart of an ox and an almost perfect gene structure of a 9.3". But was scientist could not account for was his unhappiness and desire.