It may be burden of proof. Where I live, criminal court is to be thought of as 99% proof of guilt, where as civil court, eg being sued, is more like 50.1%. So

It may be burden of proof. Where I live, criminal court is to be thought of as 99% proof of guilt, where as civil court, eg being sued, is more like 50.1%. So maybe an expulsion tribunal is 50.1% too?