Haw. Rev. Stat. § 149A-15.5
(b) The department shall adopt rules pursuant to chapter 91 and subsection (a) to require the posting of pesticide warning signs containing but not limited to the following information:
(3) Any other related information the department deems helpful and appropriate for consumers.
The department may also adopt any other rules pursuant to chapter 91 necessary to effectuate this section, including rules relating to the size and placement of warning signs.
[L 2007, c 174, §1]