An example of industry fraud
Fluorescent tubes are used in almost all illuminated signage and require replacing periodically. A common fraud executed in the sign industry occurs when dishonest companies are asked to replace these tubes. Unless you are present to witness the tubes being replaced, how do you know that tubes from the firm's previous job, down the road, aren't being re-used in yours? It is possible that the components are second-hand, and will need replacing long before the expiration of their design life.
Imagine you have 25 retail outlets, each with four signs needing 40 tubes replacing, the cost of replacing one tube is say £5. With prior knowledge of the scam £20,000 could have been saved.