I don't know what legal grounds he could have used to execute the arrest.
He he may have violated dept. Protocal in the execution of charges. That will result in the case kicked out along with some discipline of the officer.
You can't have an officer making arrest in a personally involved case. He is required to step aside and let others followup.
Further the was no indicated physical harm to the kid, so no complaint there.
Depriving of electronic toys are not considered unususual punishment.
I am glad i don't have a discipline problem with my daughter, at least i don't have an ex to deal with, out of out lives for 10 years without a word.