>If the fake answers were all wrong, just grade the test honestly and the cheaters will get what's coming to them without any ambiguity or additional overhead on his part.
Failing that one exam (especially if they got some of the questions right despite cheating on others, so, for example got a 50% grade on the exam) may have allowed some of them to still get a passing grade in the course, the penalty for cheating may be worse:
I am in discussion with my Chair about exactly what response is appropriate for these students, but a zero on the final is the bare minimum, and an F in the class is likely for some, if not all of those who cheated.
(and some schools may have additional penalties in the form of academic probation or even expulsion)
Failing that one exam (especially if they got some of the questions right despite cheating on others, so, for example got a 50% grade on the exam) may have allowed some of them to still get a passing grade in the course, the penalty for cheating may be worse:
I am in discussion with my Chair about exactly what response is appropriate for these students, but a zero on the final is the bare minimum, and an F in the class is likely for some, if not all of those who cheated.
(and some schools may have additional penalties in the form of academic probation or even expulsion)