1. Lie Detector By Lisa Zahray

2. A lie detector is a machine that can tell if a person is lying or not.

3. John Larson invented the lie detector in 1921.

4. It’s uses are it’s used in police interrogation and investigation since 1924,and other people use it to tell if a person’s lying or not.

5. Now it is no mystery if someone’s lying or not.

6. Did you know that the polygraph’s (lie detector’s) test results can not be used in court?

7. THE END