(a) Within 120 days of the receipt of a charge, the Special Counsel shall undertake an investigation of the charge and determine whether to file a complaint with respect to the charge.

(b) If the Special Counsel determines not to file a complaint with respect to such charge by the end of the 120-day period, or decides to continue the investigation of the charge beyond the 120-day period, the Special Counsel shall, by the end of the 120-day period, issue letters to the charging party and respondent by certified mail notifying both parties of the Special Counsel's determination.

(c) When a charging party receives a letter of determination issued pursuant to paragraph (b) of this section, the charging party, other than an officer of the Department of Homeland Security, may file a complaint directly before an administrative law judge in the Office of the Chief Administrative Hearing Officer (OCAHO) within 90 days after his or her receipt of the Special Counsel's letter of determination. The charging party's complaint must be filed with OCAHO as provided in 28 CFR part 68.

(d) The Special Counsel's failure to file a complaint with respect to such charge with OCAHO within the 120-day period shall not affect the right of the Special Counsel to continue to investigate the charge or later to bring a complaint before OCAHO.

(e) The Special Counsel may seek to intervene at any time in any proceeding brought by a charging party before OCAHO.