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Of the five kits analysed by the BBC, one did not produce a readable result; three came back all clear; but one did show a solid dark line, indicating a PSA level above 4.0 ug/l.

A private blood test taken the same day and sent to a laboratory showed a much lower reading of 0.27 ug/l.

"They can work with Heads of Department and the UG Director of Education to consider adjustments."

UG stands for undergraduate, but the whistleblower claimed to BBC News NI that some staff also felt under pressure over marks for postgraduate qualifications.

"Remarkably, the YM022 shows anxiolytic effects with a dose of 3.0 ug/kg, which is 3,000 times lower than the required dosage of current antidepressants," said Professor He.