§ 500. Declaration of policy. It is the policy of this state that all litigants in the courts of this state entitled to trial by jury shall have the right to grand and petit juries selected at random from a fair cross-section of the community in the county or other governmental subdivision wherein the court convenes; and that all eligible citizens shall have the opportunity to serve on grand and petit juries in the courts of this state, and shall have an obligation to serve when summoned for that purpose, unless excused.