To enact special legislation to authorize the Town of Dartmouth to establish and maintain a medical claims trust fund into which amounts may be appropriated by Town Meeting to reimburse work-related medical claims for police officers , pursuant to the provisions of section 100 and 100B of chapter forty-one.  Costs of insurance or reinsurance for these medical claims and outside claims services may be disbursed from said funds.  Notwithstanding the provisions of section fifty-five of chapter forty-four, the treasurer shall be the custodian of said fund and may deposit the proceeds in national banks or invest the proceeds by deposit in savings banks, cooperative banks or trust companies organized under the laws of the commonwealth, or invest the same in such securities as are legal for the investment of funds of savings banks under the laws of the commonwealth or in federal savings and loan associations situated in the commonwealth. Any interest or return of premium or claims advance, excluding dividends applicable to section eight or eight A, shall be added to and become part of the fund. The treasurer shall invest and reinvest as aforesaid such funds to the extent not required for current disbursement as determined by the Town. Any interest liability incurred as the result of processing a tax anticipation loan authorized by section four of chapter forty-four, and directly related to the establishment or the continuance of the aforesaid claims trust fund, shall be chargeable to said fund. The treasurer shall take measures that will assure a sufficient balance at all times in said fund to make prompt payment for incurred and unpaid claims and other related liabilities