dual purpose doctrine
dual-purpose doctrine. The principle that an employer is liable for an employee’s injury that occurs during a business trip even though the trip also serves a personal purpose. Cf. DUAL-CAPACITY DOCTRINE. [Cases: Master and Servant 302(2, 6); Workers’ Compensation 661. C.J.S. Employer–Employee Relationship §§ 204–217, 221–223; Workmen’s Compensation §§ 401–402.]