In what circumstances will a probation officer be induced to admit to a violation of the conditions of his probation?

In this case, appellant was induced to admit that he had violated the conditions of his probation only after the judge [29 Cal.3d 674] made an express personal commitment not to send him to prison. In addition to admitting the violation and giving up his procedural rights to contest whether the violation occurred (see People v. Vickers (1972) 8 Cal.3d 451, 455, 105 Cal.Rptr. 305, 503 P.2d 1313), appellant was also required by the terms of the bargain to submit to a 90-day period of diagnostic confinement at a state prison facility before the final sentencing decision was made. Appellant in all respects complied with his end of the bargain, admitting the probation violation, giving up his procedural rights and undergoing the period of diagnostic imprisonment.