(1) Except as hereinafter provided, the Lokayukta shall not investigate:—
(i) any matter, in respect of which, a formal and public inquiry has been ordered with the prior concurrence of the Lokayukta;
(ii) any matter which has been referred for inquiry, under the Commission of Inquiry Act, 1952 (Central Act 60 of 1952);
(iii) any complaint involving an allegation of corruption made after the expiry of a period of five years from the date on which the matter or conduct complained against is alleged to have taken place:
Provided that the Lokayukta or Upa-Lokayukta, as the case may be, may entertain a complaint made after the expiry of the period specified in sub-clause (iii) above, if the complainant shows sufficient cause for not making the complaint within the said period:
Provided further that in respect of an investigation of a complaint involving allegations of corruption, once the complaint is entertained and is being investigated, nothing shall prevent the Lokayukta or Upa-Lokayukta from investigating and enquiring into acts of corruption which may pertain to any period prior to the said period of five years.