The McDonald triad is a trio of factors that may lead to violent tendencies and possibly the person being a serial killer. Please note that these factors are not concrete, and these aren’t the only behaviors that can lead to violence. Even the man who coined it, John Marshall McDonald, was unsure of the accuracy. Anyway, the three possible indicators are:
- Cruelty to animals
- Setting fires
- Bed wetting.
What do you guys think? Do you know any signs that aren’t in the triad?