Is it a technical violation? Yes probably.. but is it worth a 148? NO - Maybe a 415 infraction especially if you are working for the school district. You have an attorney. Discuss this with him/her. Good luck!
You say you have an attorney already. You must discuss this question with him.
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Yes. In People v. Christopher (2006) 137 Cal.App4th 418, this happened and the conviction under 148 was upheld on appeal.
Is it fair? Well, that is a tough question. The courts have decided what is legal and what is not, so what is fair perhaps is beside the point. Sorry.
Yes. It is an uglier crime (PC 32) if your husband's warrant was for a felony.
Every person who, after a felony has been committed, harbors, conceals or aids a principal in such felony, with the intent that said principal may avoid or escape from arrest, trial, conviction or punishment, having knowledge that said principal has committed such felony or has been charged with such felony or convicted thereof, is an accessory to such felony.