I made a post with a lot of sources about horrific Israeli treatment of prisoners in the comments of this thread about a doctor detailing abuse in the prison he worked in. I won’t copy/paste, just say the TL:DR is that for over a decade Israel has detained without charge/trial, systematically tortured, and even raped Palestinian prisoners (including minors). They coerce confessions from these children and adults by using all of those methods.

If you want evidence for those allegations, I tried to keep that linked post to a 2-minute read and include only what is confirmed by credible sources.