I converted my second kidnapped person with my relatively newbie(50 juice) founder. Both persons were lawyers. My char had 14 heart, 1 wis and 3 interrogator skills.(And he also had 4 persuasion and 2 law that probably helped.) The first "subject" had about 6 heart, 7 wis, 7 health and I went rough on him. I tried a number of combinations of pressure but he always lowered his heart alongside his wisdom, became 1 heart, 1 wisdom, 5 health in about 6 days and suicided immediately after. Good thing the interrogator skill progressed to 4 as a result.
The second one was kind of easy/lucky for me as he as a conservative lawyer had 8 heart, 7 wis and 3 health. This one had perfect (except tied up) treatment and a debate every day. In 3 days he lowered his wisdom by 1, upped his heart by 1 and then had a conversation that raised the wisdom of my founder to 2 and he started to like his interrogator. 2 more days of debate, I untied him in the end and immediately got my first ever sleeper.
P.S. Getting wisdom to 2 is probably not so bad as it will probably rise skill limit on law to 4 making my founder even better in court.
P.P.S My first post about LCS. I'll get to the code one day if LCS would still have something useful left to implement by that time.