Perayu tidak mempertikaikan bahawa pemberian penangguhan adalah budi bicara HMS. Walau bagaimanapun, budi bicara tersebut mesti dilaksanakan mengikut undang-undang. Mahkamah Persekutuan dalam kes Liaw Kwai Wah & Anor v Public Prosecutor [1987] 2 MLJ 69 memutuskan bahawa: - “Maxwell on The Interpretation of Statutes, 12th Ed., at pp. 147–8, under the Heading “The exercise of discretion must be reasonable,” states that— “Even though an act done is ostensibly in execution of a statutory power and within its letter, it will nevertheless be held not to come within the power if done otherwise than honestly and within the spirit of the enactment. A discretion is to be ‘regulated according to known rules of law,’ (Lee v Bude & Torrington Junction Ry Co (1871) LR 6 CP 576 per Willes J. at pp. 580, 581), and not the mere whim or caprice of the person to whom it is entrusted on the assumption that he is discreet … ‘It is true,’ said Lord Greene M.R. in Associated Provincial Picture Houses Ltd v Wednesbury Corporation [1948] 1 KB 223 at p 229), ‘the discretion must be exercised reasonably.’” The principles which should guide the courts in the exercise of the revisionary powers have been clearly set out by Jenkins C.J. in Emperor v Lachiram ILR 28 Bom 533. In that case his Lordship said that “this controlling power of the court is a discretionary power and it must be exercised with regard to all the circumstances of each particular case, anxious attention being given to the said circumstances, which vary greatly.”