Ordinarily, a mere denial of the charges without further information is insufficient to raise a colorable claim.
There can be no colorable claim of innocence if the prisoner or parolee has been convicted of the charge in court, or has been found guilty of the charge in probation revocation or disciplinary proceedings.
The strength of the colorable claim must be weighed against the prisoner's or parolee's ability to speak for himself. If he has a colorable claim of denial, he is presumably entitled to assistance of counsel unless he is particularly capable of speaking for himself.
There may be situations where circumstances aggravate the character of the violation. Disproving such aggravating circumstances must be considered a process of justification or mitigation. If such aggravating circumstances are complex or otherwise difficult for the prisoner or parolee to meet, it should be presumed that counsel is needed.
Cal. Code Regs. Tit. 15, § 2693