FBI officials have revealed the details of a new biometric criminal history monitoring programme that will be piloted at Dallas/Fort Worth International Airport in autumn.Speaking to Dallas News, William McKinsey, section chief of biometrics for the FBI said that the system will use a Texas Department of Public Safety database of electronic fingerprint images to check for felony-level offenses only.”if someone commits a felony-level offense, we will let the appropriate subscribing agency know, and then they will take whatever action they think is appropriate.”Rap Back will uses the fingerprints that employees provide when they're hired, also tracking future arrests and other legal entanglements. Currently, employee background checks provide only a “one-time snapshot” of someone's criminal history, the FBI says.Law enforcement agencies can access the service for free. They are expected to use it to monitor those under criminal investigation as well as prisoners, parolees, probationers, law enforcement contractors and sex offenders.Civilian employers will be charged a fee. McKinsey said he expects employers will use Rap Back to monitor school teachers, doctors and nurses, pilots, youth league coaches, caregivers for the young and old, and others.”It is critical that only persons with appropriate backgrounds are allowed into positions serving children, elderly, sick, disabled and other vulnerable populations,” according to an FBI white paper about the program.