Case Study 21: Theft Case in Local Parcel Delivery Firm

Mike Rumble

Oct 3, 2025

Last Update: Jun 28, 2026

Background

Our client was the owner of a local parcel delivery firm which he had started some 15 years earlier, building the business from one man with a van to now employing 12 delivery drivers and 3 administration staff.

The company had long-term contracts with High Street names, and until six months ago, everything was fine. Around that time, the company started receiving complaints about items not being delivered.

The Problem

They conducted a process audit and confirmed the items had been received by them but certain high value electrical items that should have been delivered were missing from their warehouse.

The company had already paid for a private detective agency to follow their couriers and check that deliveries were being made, and had also installed covert CCTV in the warehouse but nothing untoward was observed. Yet, over the weeks, the theft of items continued, and the client was in real jeopardy of losing major contracts.

The Tests

We were instructed to conduct polygraph examinations on all of the staff, and everyone passed. The owner was mystified and somewhat disappointed with the result, having been convinced that it must be an inside job.

We reviewed each pre-test interview, every polygraph chart, and every post-test interview, and we were confident in our results.

The Turning Point

It was then that one of our team, who had worked on a similar case abroad, suggested that the management team, such as the owner and his son, the only ones above suspicion, should be asked to take a polygraph. At first, the client was stunned that we should suggest such a thing, but he eventually agreed.

Outcome

The client passed his test. The son, who had supervised the deliveries and the installation of the CCTV, left the company the same day. There have been no further thefts reported since.

This case highlights that sometimes the source of a problem may be closer than expected. By remaining thorough, professional, and open-minded, the polygraph process helped the client uncover the truth without wrongly accusing loyal staff. Trust, verification, and transparency are crucial in resolving internal disputes and safeguarding a business’s reputation.

If your business is facing unexplained losses or internal theft, a professional lie detector test can help identify the source quickly and accurately, protecting both your staff and your company. Book a polygraph test today to safeguard your business.

 

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.