Case Study 12: Theft by Employee at Restaurant Chain

Mike Rumble

Sep 29, 2025

Last Update: Jun 28, 2026

Background

When we received a call from a very well-known restaurant, the last thing we thought of was that they would be asking us to conduct a series of polygraph tests on their employees. A very wealthy client had lost his wallet in the restaurant, and as usual on his visits, he had been the last to leave and hadn’t noticed his missing wallet until he returned home.

The following morning, he had telephoned the restaurant expecting them to have found it, but after a search was made, they were unable to locate it.

The Request

The customer was not happy, and in fact, it was he who suggested that the staff be polygraph tested. We attended the venue the same day, and five staff members were tested, all of whom passed the polygraph test. Two staff members refused to be tested, and one of those two walked out of his employment. The owner was not impressed.

For some inexplicable reason, he had decided that one of the staff who had taken the test was lying and was as guilty as hell!

Reviewing the Results

We took the owner through each and every test result, showing him how the employees had reacted and how they had passed, yet he was still not convinced.

It was only as we were leaving that a waiter mentioned changing the CCTV recorder to his boss. We all stopped mid-exit, turned, looked at each other, and, almost like a comedy movie, ran back upstairs following the client to retrieve the CCTV.

The Discovery

We very quickly fast-forwarded to the period when the diner had left the restaurant. Minutes later, the employee who walked out of his job could be seen clearing the table, and oops, he dropped something, but unfortunately for him, he could very clearly be seen picking up a rather fat wallet and stuffing it in his apron pocket.

Conclusion

We have a saying, “the polygraph works in mysterious ways”. Sometimes it tells you more about the people who refuse to take a test than it does about those who do.

This case highlights how employee dishonesty can not only damage trust but also put a business’s reputation at risk. While polygraph tests cleared the innocent staff, it was ultimately the combination of testing and CCTV evidence that uncovered the truth.

Employers should never underestimate the value of a thorough investigation when theft occurs. If you face similar challenges in your workplace, our professional lie detector services can help you uncover the truth quickly and fairly. Contact us today for confidential advice.

 

Mike Rumble
Mike Rumble

Mike Rumble is a former detective with years of experience in the investigation and lie detection field. He has been the advocate for polygraph tests for more than 4 decades. He is the founder and chief examiner of Lie Detectors UK Services, the most prestigious Lie Detection company in the UK.