3. Section 4 of the Principal Act is amended—
(a) by omitting from the definition of “medical practitioner” in subsection (1) “1930” and substituting “ 1930 , or a person who is an approved qualified person within the meaning of section 38A of that Act”; and
(b) by inserting the following definition:
“ ‘one-way box' means a locked box, with a hole capable of receiving containers of blood samples, from which the containers cannot be removed unless the box is unlocked with a key kept by an approved analyst;”.