It is to be noted that in terms of Section 91, although a sentenced prisoner is granted a remission of one third of his sentence on
his admission to prison, he still runs the risk of that remission, or part thereof, being forfeited. This provision in the Act is
in its effect similar to the practice adopted in many countries of remitting one third of a prisoner's sentence on the grounds of
his good behaviour while in prison.
The question we have to determine has been considered and dealt
with in the courts in other countries. In England two separate cases
involving this question were dealt with together on appeal. The
appeal case is reported as MAGUIRE AND ENOS (1956) 40 Cr. App
R. 92 CCA. In one of the cases the sentencing court, on the question
of sentence, had stated the following:
"In order to secure — that you should be removed from criminal circulation for four years and eight months, owing to the provisions that you automatically
receive a reduction of a third of your sentence for good behaviour, we have to sentence you to seven years —."
In the other case the following was stated by the sentencing court:
"Under the law of this country you will serve two-thirds of any sentence we pass upon you, and in order to keep you in prison
and out of mischief for three years and four months we have to pass a sentence of five years