Each petty cash fund shall be maintained under an imprest system whereby the total of petty cash on hand plus the amount of petty cash vouchers at any one time must equal the original amount of the petty cash fund. In order to preserve the accountability of the original amount, petty cash must not be commingled with other collections of an agency, except that collections may be included in petty cash funds used exclusively for making change during the periods between deposits.
Haw. Code R. § 3-11-6