With the exception of police cautions, only convictions can be "cited" in court to assist in sentencing. Cases which result in no conviction cannot be cited.
The CPS are not entitled to mention such cases. If they did, and if your husband believes it resulted in a harsher sentence, he has grounds to appeal against that sentence.
It is hard to imagine any judge allowing such action to take place, let alone being swayed by it to impose a harsher sentence.



