Hundreds of Metropolitan Police officers must re-sit their promotion exams after a series of mistakes.
The force said staff shortages and technical problems had forced them to scrap results for 562 candidates hoping to become inspectors.
It will cost £73,000 for the exam, taken on 12 March, and selection process to be repeated, the Met said.
A spokeswoman said supervision on the day had been "inadequate" but the candidates were not to blame.
Lol how stupid! But it should be made clear that in the rest of the report it goes on to confirm that it isnt due to any form of cheating. BBC News Report