Psychologist Leanne ten Brinke has spent decades studying toxic personality traits. What are the red flags to look out for among workmates, politicians and potential partners? Psychologist Leanne ten Brinke has spent decades studying toxic personality traits. What are the red flags to look out for among workmates, politicians and potential partners? C oming face to face with a probable psychopath was enough to make Dr Leanne ten Brinke rethink her career choices. Early in her 20s, while