It can be very difficult to measure the scope of employee crime accurately because it is not always clear when employee crime has occurred. Let us look at two examples.
First, it is possible for employees to help their friends steal merchandise. The employee might, for example, ring up only one or two items and let their friend walk out with many other items that were not paid for. The problem with this is that it can very difficult to determine how much of this has happened and how much of the loss has been due to shoplifting.
Second, let us imagine that an employee steals the personal information of a large group of customers. It is unlikely that the employer would ever know that the information had been stolen because it would, of course, not be physically taken.
In both of these cases, employee crime is hard to detect and therefore hard to measure.