Except as otherwise provided in this section, the Commissioner may conduct an investigation to determine whether a provision of this title has been violated on the Commissioner’s own initiative or may require a written complaint. The Commissioner may conduct an investigation under Subtitle 3 of this title, on the Commissioner’s own initiative or on receipt of a written complaint of an employee. The Commissioner may conduct an investigation to determine whether Subtitle 5 of this title has been violated on receipt of a written complaint of an employee. The Commissioner may conduct an investigation to determine whether Subtitle 6 of this title has been violated on receipt of a written complaint of a sales representative. The Commissioner may investigate whether § 3–701 of this title has been violated on receipt of a written complaint of an applicant for employment. The Commissioner may investigate whether § 3–702 of this title has been violated on receipt of a written complaint of an applicant for employment or an employee. The Commissioner may investigate whether § 3–704 of this title has been violated on receipt of a written complaint of an employee. The Commissioner may investigate whether § 3–710 of this title has been violated on receipt of a written complaint of an employee as provided in § 3–710(d)(1) of this title. The Commissioner may investigate whether § 3–711 of this title has been violated on receipt of a written complaint of an employee as provided in § 3–711(d)(1) of this title. The Commissioner may investigate whether § 3–712 of this title has been violated on receipt of a written complaint of an employee or applicant. The Commissioner may investigate whether § 3–801 of this title has been violated on receipt of a written complaint of an employee. The Commissioner may investigate whether § 3–802 of this title has been violated on receipt of a written complaint of an employee. The Commissioner may investigate whether Subtitle 9 of this title has been violated: on the Commissioner’s own initiative; on receipt of a written complaint signed by the person submitting the complaint; or on referral from another unit of State government. The Commissioner may conduct an investigation to determine whether Subtitle 10 of this title has been violated on receipt of a written complaint of an employee. The Commissioner may conduct an investigation to determine whether Subtitle 12 of this title has been violated on receipt of a written complaint of an employee. The Commissioner may conduct an investigation to determine whether Subtitle 14 of this title has been violated on receipt of a written complaint of an applicant or employee. The Commissioner, on the Commissioner’s own initiative or on receipt of a written complaint, may conduct an investigation of whether a local minimum wage law has been violated. The Commissioner may conduct an investigation to determine whether Subtitle 13 of this title has been violated on receipt of a written complaint by an employee. To the extent practicable, the Commissioner shall keep confidential the identity of an employee who has filed a written complaint alleging a violation of Subtitle 13 of this title unless the employee waives confidentiality. The Commissioner may conduct an investigation to determine whether Subtitle 16 of this title has been violated on receipt of a written complaint by an employee.