Xi You's act of drugging involved a substance commonly found in prescription medications with sedative and sleep-inducing effects. What he used was a refined, colorless, and tasteless version of the drug, with exceptionally potent effects.
If it weren't for the intense media scrutiny and the tireless investigation by Bo Yan and Han Yifan, this incident could have been settled with a payoff. After all, although he tied up that woman and whipped her a few times, he hadn't actually gone through with his intentions; it was merely an attempted crime. Xi You wielded considerable influence in the area, and if he could have reached a settlement with the victim, he likely wouldn't have spent even one day in detention.
Unfortunately for him, he met his match.
Bo Yan even managed to steer the narrative toward his family's pharmaceutical company. With the company already in crisis, they couldn't protect him, and with the media watching, they could only allow the tests to proceed.