Over the last two weeks, PAS president Abdul Hadi Awang has come under attack over his assertion that non-Muslims and non-Bumiputera comprise the bulk of the “root of corruption” in Malaysia.

In his defence, the party’s central committee member Mohd Zuhdi Marsuki claimed a “study” found that most people convicted of giving bribes between 2010 and 2014 were non-Malays.

While he did not give many specifics about the supposed “study”...