Section 15

A person shall be presumed, until the contrary is proved, to have used or inhaled any intoxicating substance for the purpose of inducing or causing in himself a state of intoxication if the specimen of blood provided by him under section 14 is certified by a Government analyst to contain an amount of any chemical compound specified in the first column of the Schedule in excess of the amount specified in the second column thereof in relation to that chemical compound.

Government analyst certificate.