How do I know if an employee is undercover?

Usually this suspicion can be arranged when two people are doing important work together, such as looking at the house and talking about bills. In addition, the report of work content should be more detailed, and these things should be done from the perspective of management. If she is really good, it should be easier to make a list, and it will also give some pressure if she fails to make a result at the moment. After a long time, either she really went undercover or the salesman with good poetry and songs created achievements for the company.