6. After section 15 of the Principal Act the following section is inserted:
“15A. (1) If only 1 sealed container of a particular person's blood has been put in a one-way box for collection by an approved analyst, the analyst shall analyse the blood to ascertain the concentration of alcohol in the blood.
“(2) If 2 sealed containers of a particular person's blood have been put in a one-way box for collection by an approved analyst, the analyst shall—
(a) analyse the blood in 1 of the containers to ascertain the concentration of alcohol in the blood; and
(b) keep the other container sealed and under refrigeration until—
(i) the person, or another person authorised in writing by the first-mentioned person to collect the unanalysed blood sample, requests the analyst to give him or her that sample; or
(ii) the period of 6 months after the blood was taken from the person ends;
whichever happens first.”.