How creditable are witnesses that admitted in court to years later, that they were drinking and doing Nitrogen oxide?

It will depend what the jury believes. Robert Driessen

Regarding CA pardons, I've noticed that all pardoned in recent years have not done time in prison. Does prison bar a CA pardon?

If you are truly looking for a pardon a few million dollars will be the most helpful thing for you. Robert Driessen

What is the difference between getting an arrest exempted or dismissed? and how can I get my arrest dismissed in Cali?

In looking at the comments she plead guilty to the charge. This means that no you cannot now seek a finding of factual innocence to get the arrest...

Is purjury in a criminal trial grounds enough for a new trial

I am not sure I fully understand your question but it appears that you were found guilty and you feel that one of the witnesses was not truthful....

My son was charged with assualt. Judge dismissed then mentioned 150.00 costs as we left Does my Son Pay this ? No Orders given ?

Yes this is the Fee for the use of the public defender. Robert Driessen

Petty theft lessened to infraction. Paid a $250 fee. What others steps should I take to appeal or dismiss?

Even if this was an infraction you can have it expunged by filing a 1203.4a. This can be done one year after you were sentenced. Robert Driessen

If this was filed as an infraction you can see if the judge will lower the cost. If this is a misdemeanor seek the services of the public defender....

Should my daughter have her records sealed for shoplifting as a minor?

Yes this will not always be sealed automatically. She should go back to court and get the arrest record sealed. Robert Driessen

What can be done if you receive an inmate notification of detainer receipt?

You need to file a 1381. Robert Driessen

I lost dmv hearing due to refusal. Got a speed ex without dui school requirement from the court. Should I still take dui classes

I agree call the DMV mandatory actions unit. If you refused according to the DMV you will lose your license for one year. Robert Driessen