Me. Rev. Stat. tit. 26, § 618

This subchapter does not limit an employer's right to promulgate and maintain lawful workplace policies governing the use of the employer's electronic equipment, including a requirement that an employee disclose to the employer the employee's user name, password or other information necessary to access employer-issued electronic devices, including but not limited to cellular telephones and computers, or to access employer-provided software or e-mail accounts.