51. (1) Where a sample taken from a person under section 48 or 49 proves to be insufficient or was inadequately labelled or, for any other good reason, a member of the Garda Síochána considers that it is necessary for a second or further such sample to be taken from the person, a second or further sample may be taken from him or her in accordance with the section concerned.

(2) Where a sample taken under section 48 in relation to a missing person proves to be insufficient or was inadequately labelled or, for any other good reason, a member of the Garda Síochána considers that it is necessary for a second or further such sample to be taken, a second or further sample may be taken in relation to the missing person in accordance with that section.

(3) Where a sample taken under section 50 from the body of an unknown deceased person proves to be insufficient or was inadequately labelled or, for any other good reason, the coroner to whom the death of that person is reported under the Coroners Act 1962 considers that it is necessary for a second or further such sample to be taken, a second or further sample may be taken from that body in accordance with that section.