21 c) twenty years after the person was sentenced to imprisonment of more than two years but no more than five years, or after the waiving of punishment under Chapter 3, section 3 of the Penal Code (39/1889); 6) message transmission data is deleted two years after the transmission of the message; 7) modus operandi data and personal descriptions data are deleted one year after: a) the conclusion of the pre-trial investigation if it has become evident in the pre-trial investigation that no offence has been committed; b) a decision made by the pre-trial investigation authority under section 2(2) of the Pre-trial Investigation Act to waive the measures required for the bringing of charges against the person guilty of the offence; c) the expiry of the statute of limitations for the suspected offence if it has become evident in the pre-trial investigation that no one can be charged for the offence; d) the file keeper was informed of the prosecutor’s decision made under Chapter 1, section 7 or 8 of the Criminal Procedure Act (689/1997) or other corresponding provision in the law to waive the measures required for the bringing of charges against the person guilty of the offence, or after the prosecutor’s decision stating that no offence has been committed or that there is no proof of an offence; e) the file keeper was informed of a final court decision on waiving the charges brought against the data subject, or on waiving the charges on account of the expiry of the statute of limitations; 8) identification data is deleted one year after the person was found or the unidentified deceased person identified;