If I am an employee, it stands to reason that if my work is never evaluated I will begin to feel like it is not very important. If I feel it is not very important, it probably won't matter how well it is done. If it doesn't matter how well it is done, then it will be done poorly. After all, who cares? This scenario is the major reason why frequent inspections are a must.
If employees know that their work is never evaluated, they may tend to let their standards slip. A random schedule of inspections will ensure that an employee's assignment is inspected frequently, and the random nature of the schedule will ensure that the employee will never know when that inspection will occur. If there has not been a very systematic system for inspections at your facility, this entire program may require significant time investment on the manager's part in order for it to be successful. It may also be met with some resistance since most of the employees are accustomed to performing their work based on their own standards.