- Moderate
- 1. The Cuckoo's Calling (3 episodes): Main character smokes cigarettes. Dialogue references to a character having a cocaine habit. A few scenes take place around pubs and nightclubs where alcohol is consumed. One scene of drunkenness. A character has pills hidden in her purse.
- 2. The Silkworm (2 episodes): Main character smokes cigarettes. A few scenes take place at pubs, restaurants, or parties where alcohol is consumed.
- 3. Career of Evil (2 episodes): Main character smokes cigarettes. A few scenes take place around pubs or meals where alcohol is consumed. One scene of drunkenness. It is said, one character's mother died of an overdose.
- 4. Lethal White (4 episodes): Main character smokes cigarettes. Alcohol is occasionally consumed; a few scenes take place around bars and parties and main characters drink alcohol in their office. At a party, background characters are shown with a bong. Dialogue references to a character who got "high."
- 5. Troubled Blood (4 episodes): Main character smokes cigarettes. Alcohol is consumed. The main character is intoxicated and argumentative during one scene, and later shown to be hungover. One character is shown vaping. Another character snorts a substance.