Section 17(3)(b) in The Dock Workers (Safety, Health And Welfare) Act, 1986
(b)in the case of an offence punishable with imprisonment,-(i)within one year from the date of the offence; or(ii)where the commission of the offence was not known to the Inspector, within one year from the first day on which the offence comes to the knowledge of the Inspector; or(iii)where it is not known by whom the offence was committed, within six months from the first day on which the identity of the offender is known to the Inspector.