• The Borrowed Servant Rule is a common law legal doctrine that if an employer (commonly referred to in this rule as a special employer) borrows a worker from another employer (commonly referred to in this rule as a regular employer), the special employer may be liable for the actions of the agency worker, despite the fact that a permanent relationship between the employee and the employer does not exist. The employee employment rule applies when there is an express or implied contract of employment between the special employer and the affected worker, the worker is primarily employed by the special employer, and the special employer controls the details of the work.