If you are otherwise qualified, you would be entitled to Unemployment Insurance (UI) benefits unless you voluntarily quit your job or were discharged for misconduct. The use of intoxicants such as drugs or alcohol may constitute misconduct depending on the circumstances. The California Employment Development Department (EDD) has published a UI Benefit Determination Guide which provides guidance on misconduct and the use of intoxicants. (See links below.) The refusal to sign paperwork when you were terminated would not ordinarily be misconduct and should not be a reason for you not to make a benefit claim.
As Mr. Swenson point out, if you are otherwise qualified for benefits, then simply refusing to sign the terminating paperwork does not make a difference to your eligibility for unemployment benefits, and under your circumstances you should be entitled to benefits.
Sacramento Employment Lawyer