Whether Sections 52, 55 and 57 of the NDPS Act is mandatory or directory?

NDPS-This Court in Gurbax Singh vs. State of Haryana (2001) 3 SCC 28 held that these provisions are not mandatory provisions and they are only directory. In the present case, we do not find any serious violation of these provisions. The prosecution adduced evidence to prove that these provisions have been substantially complied with and the Sessions Judge discussed these matters in detail and accepted the prosecution case.