All tests, either official or private, shall be made according to the standards established and methods prescribed and by laboratories or individuals approved by the board. Tests shall be accepted only where the technic employed in conducting them has been approved by the director of the division who also may refuse to accept any test.

L.1946, c. 257, p. 895, s. 7. Amended by L.1950, c. 9, p. 32, s. 4.