Some businesses have trouble with employee theft, and they need to make sure that they are hiring someone who is honest and trustworthy. Talk to the interviewer about the steps you would take if you caught a co-worker stealing.
"I am sure that you have an internal policy for employee theft so I can assure you that I would follow the required steps to report the theft. I am a trustworthy person with a strong track record of honesty with my previous employers."
"If I caught an employee stealing, I would report the incident immediately. As a previous manager, I understand the value of employee honesty."
"When I work for an organization, I tend to take pride in the work we are doing. With a focus on delivering value to a company wherever possible, I would feel obligated to report a co-worker stealing from the hotel. I will refer to any policy or guidelines available and speak to the manager in charge of the department where theft is taking place."