Someone says that drug dealers are the residue of the society.
Examples (Wiktionary)
Mandarin
但是，狗不如的人间渣滓张成泽背叛党和领袖天大的信任和深恩的栽培，犯下了令人发指的大逆行为。
但是，狗不如的人間渣滓張成澤背叛黨和領袖天大的信任和深恩的栽培，犯下了令人髮指的大逆行為。
dàn shì ， gǒu bù rú de rén jiān zhā zǐ zhāng chéng zé bèi pàn dǎng hé lǐng xiù tiān dà de xìn rèn hé shē nēn de zāi péi ， fàn xià le lìng rén fà zhǐ de dà nì xíng wéi ．
However, despicable human scum Jang Song Thaek, who was worse than a dog, perpetrated thrice-cursed acts of treachery in betrayal of such profound trust and warmest paternal love shown by the party and the leader for him.