How long should information about polygraph exams be kept?

The following documentation must be retained for three years from the date a polygraph exam is conducted or requested, according to the Employee Polygraph Protection Act:

• a copy of the statement that sets forth the specific incident or activity under investigation and the basis for testing that particular employee

• records specifically identifying the loss or injury in question and the nature of the employee's access to the person or property that is the subject of the investigation

• the test's written questions

• all opinion lists and other records relating to polygraph tests of such persons and any charges stemming from them.