The petitioners are seeking appointment to the post of Laboratory Technician as a direct recruit. It is within the discretion and domain of the State respondents to prescribe the norms of eligibility adjudged to be best suited for a post and this Court, in exercise of the power of judicial review, would not interfere, unless such prescription is patently illegal and unconstitutional. Alteration in the existing criteria of eligibility rendering some ineligible thereby, would not ipso facto, make the modification invalid. That the qualifications for the post of Laboratory Technician prescribed by the 2013 Rules are either irrelevant or have no correlation whatsoever with the nature and quality of the services relatable thereto, is not discernible on the face of the records. As the qualifications mandated for the in-service candidates would reveal, the earlier norms of eligibility, in the alternative, have been retained for them. As the in-service