Me. Rev. Stat. tit. 18-C, § 6-221

A financial institution may enter into a contract of deposit for a multiple-party account to the same extent as it may enter into a contract of deposit for a single-party account, and may provide for a POD designation and an agency designation in either a single-party account or a multiple-party account. A financial institution need not inquire as to the source of a deposit to an account or as to the proposed application of a payment from an account.