An entry exam for one of France's top legal schools is to be rerun because some candidates were allowed to go to the toilet during the five-hour test.

Toulouse University confirmed Monday that one of the examinations for would-be entrants to its law school will have to be taken again by every candidate because a sympathetic supervisor allowed some desperate students to take a comfort break.

The show of compassion came after a female student, unable to hold out any longer, gave up altogether and fled the exam room in tears.

University authorities deemed that the supervisor had "exceeded his authority" and may have handed the students allowed to visit the bathroom an unfair advantage in light of the contemporary prevalence of cheating by smartphone.

The exam will be held again on October 5 and this time the students will have been warned: make sure you've gone before you sit down and be ready to cross your legs for the duration.

French students and school pupils have somewhat of a bad reputation when it comes to cheating in exams. Earlier this year the government announced a major crackdown on school exam cheats including a ban on smartphones.

However that did not stop an audacious attempt by one schoolgirl to pass her exam, when she sent along her 52-year-old mother dressed as a teenager to take the test for her.

Unfortunately the scam were busted by the teachers.

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