Hawaii Revised Statutes Division 1. Government § 378-70

(a) In addition to any other protections under this part, a public employer shall not discharge, threaten, or otherwise discriminate against a public employee regarding the public employee's compensation, terms, conditions, location, or privileges of employment because the public employee, or a person acting on behalf of the public employee, reports or is about to report to the public employer or a public body, verbally or in writing:

unless the employee knows that the report is false.

(b) Every public employer shall post notices pertaining to the application of sections 378-70 and 396-8(e), as shall be prescribed by the department of labor and industrial relations, in conspicuous places in every workplace.