49 CFR 604.32: Investigation of complaint.

(a) If the pleadings suggest a reasonable basis for investigation, FTA will investigate the subject matter of the complaint.

(b) The investigation may include a review of written submissions or pleadings of the parties, as supplemented by any informal investigation FTA considers necessary and by additional information furnished by the parties at FTA request. Each party shall file documents that it considers sufficient to present all relevant facts and argument necessary for FTA to determine whether the recipient is in compliance.

(c) The Chief Counsel shall send a notice to complainant(s) and respondent(s) once an investigation is complete, but not later than 90 days after receipt of the last pleading specified in § 604.27 was due to FTA.