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Amendment of section 50 of Principal Act. 
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32.—Section 50 of the Principal Act is hereby amended— 
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(a) by the insertion after “is unfit to drive the vehicle” in subsection (2) of “or in whose body there is present a quantity of alcohol such that, within three hours after having been so in charge of the vehicle, the concentration of alcohol in his blood will exceed a concentration of 125 milligrammes of alcohol per 100 millilitres of blood”, 
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(b) by the substitution of the following subsection for subsection (4): 
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“(4) In a prosecution for an offence under this section, it shall be presumed that the defendant intended to drive or attempt to drive the vehicle until he shows the contrary.”, and 
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(c) by the insertion after “the repealed Act” in subsection (7) of “or under section 30 (3) or 33 (3) of the Road Traffic Act, 1968”. 
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