Level ONE: Verbal. Light questioning to full blown, red faced, vein popping screams as spittle flies over the face of the heretic in (being put to) the question. No actual physical contact (spittle not included).
Level TWO: A polite verbal warning of further actions to come. Something along the lines of "TELL ME WHAT I WANT TO KNOW YOU FILTHY CHAOS FUCKING HERETIC OR I'LL BITE YOU WITH YOUR OWN INCISORS."
Level THREE: Minor physical torture (In the same way that a cigarette is a snack), followed by verbal interrogation. Usually carrying out the previous threat, and repeating level ONE.
Level FOUR: Light physical torture (In the same way that a small sandwich and a cup of coffee is a light lunch) and psychological manipulation (Preferably a repeat of level three on the loved ones of the torturee, as well as religious torment).
Level FIVE: Psychic interrogation (Now we're talking!) with light torture similar to the previous level (Maybe toss in some scarring, thumbscrews, a little minor mutilation and maiming). Yet boring verbal interrogation. The psychic interrogation is typically less than gentle, but no more severe than a moderate beating with an iron bar.
Level SIX: This is the fun part, taking psyhcological manipulation up a notch: Sensory deprivation! Except they don't toss you in a dark room if they can avoid it. Instead, they just use drugs, psychic techniques or Holy Technology to sever all your senses and leave you floating alone in the void. But don't worry, they continue to tie your body into pretzel-like shapes so you've got a healthy dose of holy pain to come back to. Sometimes they'll just toss you in a room with no food or water for a few days, or no food but filthy water for weeks instead.
Level SEVEN: Intensive psychic interrogation! This is the part where they go and find one of those unpleasant psykers, the ones who generally are viewed with disgust (and checked for possibly heresy, given that one hand is buried in their robes while they 'interrogate' you) by honest, Emperor fearing men. This is the one that leaves your mind in tatters, a ragged garment flapping in the wind. You may need a little time away from the pressures of work, study, heresy, dressing and feeding yourself after this one.
Level EIGHT: Use of drugs. Not regular drugs, or truth serums, or stuff that today would be labelled 'russian psychiatric medicine/industrial torture chemicals'. The psychic stuff that attunes your mind to a particular psychic frequency and sucks in all the pain on a planet to break you. The kind that make you think you're locked in an oubliette. The kind that put you back into sensory deprivation.. except for pain, which you feel to the maximum of your nerves ability to carry it.
Level NINE: Unrelenting torture! Usually only used if an Inquisitor has a birthday party planned, since it's easier to shoot the heretic. Torturers have endurance competitions with this one: How long can you keep them alive and sane? How long can you keep wielding the intestinal clamps before you cramp up?

Due to the dangerous undercover nature of their occupation, Arbites detectives are expected to use every tool and skill available to them in their pursuit of justice. To this end, many of those chosen for duty as a detective are psykers trained by the Arbites Departmento Psionica to use their mental abilities to assist and protect them as they work their way through the ranks of the criminal elements with which they associate themselves. Due to the Imperium’s official stand on unsanctioned psykers, a psionic detective’s mental powers may even serve as an effective means of eliciting trust and interest from those groups he intends to infiltrate.