DRAP sent suspect drums of propylene glycol, a sweet-tasting alcohol used in over-the-counter medicines such as cough syrups, for testing
It has ordered the Directorate General of Health Services to organise recruitment tests again after an investigation found a lack of transparency in the assessment of candidates in written exams.
The candidates will not need to apply again for the new exams, it said in a letter.
The DGHS published the notice for the recruitment of 889 medical technologists, 1,800 medical technicians and 150 cardiographers in June last year amid a shortage of healthcare workers during the first wave of coronavirus infections.