Other protective service occupations include a variety of security-related occupations with different working conditions. The workplace may be a shopping centre, a retail store, an industrial plant or any other place where protection and investigation is needed. Work for many of these occupations is carried out inside for the most part. But some occupations, such as private investigators, involve outside work and travel. People in these occupations are sometimes exposed to dangerous situations when assuming their duties. Working hours may be regular, or they may vary. For example, store detectives must work during the store's business hours.