Mass. Gen. Laws ch. 106, § 9-341: Bank's Rights and Duties with Respect to Deposit Account

Section 9–341. Except as otherwise provided in Section 9–340(c), and unless the bank otherwise agrees in an authenticated record, a bank's rights and duties with respect to a deposit account maintained with the bank are not terminated, suspended, or modified by:

(1) the creation, attachment, or perfection of a security interest in the deposit account;

(2) the bank's knowledge of the security interest; or

(3) the bank's receipt of instructions from the secured party.