Suge Knight claims he's been stripped of all rights in jail ... and now he sits alone in solitary, with no visitors ... not even his mother.
Suge filed legal docs, obtained by TMZ, in which he says the L.A. County Sheriff's detective in charge of his murder case got a judge to shut down his ability to communicate with the outside world for an indefinite period of time.
Suge says he's now sitting in isolation, unable to even make a phone call.
The docs don't say why the Sheriff's Dept. wants Suge radio silent ... it could have something to do with alleged witness intimidation. We've reached out to the Dept. but they're not talking.