D.C. Code § 2-104

The said Inspector shall give bond, with 2 sufficient securities, to be approved by the Mayor, in the sum of $2,000, and he shall take and subscribe the following oath or affirmation before a notary public or a judge of the Superior Court of the District of Columbia: “I do solemnly swear that I will diligently, faithfully, and impartially execute the duties of my office without favor.”