The couple is only suspected, and there is no definitive evidence to prove they have any issues.
Upon investigation, they don't appear to have any suspicion of drugging.
Because they didn't put drugs in the dining utensils or in the food or drink.
Nor did they personally place the drugs; ordinary police officers simply cannot trace the source of such drugs.
Although a blood test might reveal slight problems in the end, it doesn't necessarily mean it was their doing.
Jiang Tang gave them a drug that is colorless and tasteless, specifically absorbed by certain individuals, and a blood test would show some issues.
The drug cannot be identified.
This is something he developed specifically to deal with villains.
In the Cultivation World, he would simply wave his hand and annihilate evil doers, without needing such complications.
This is a law-based society, so naturally, use the methods of a law-based society.
The other side intends to use drugs, don't they?
