5 U.S.C. § 3301 : US Code - Section 3301: Civil service; generally

Search 5 U.S.C. § 3301 : US Code - Section 3301: Civil service; generally

The President may - 
(1) prescribe such regulations for the admission of individuals
into the civil service in the executive branch as will best
promote the efficiency of that service;
(2) ascertain the fitness of applicants as to age, health,
character, knowledge, and ability for the employment sought; and
(3) appoint and prescribe the duties of individuals to make
inquiries for the purpose of this section.