in 300 words

Many people believe that the use of biometrics is an invasion of privacy. For example, an eye scanning device records the inner structure of a persons eye and stores that image in a database. Critics worry that databases of human traits used to maintain corporate security may actually pose a privacy threat to individuals, if such data were used in other ways. In your view, are such concerns justified? Why or why not? 

including references. No copy paste please.